diff --git a/extra1/Bsend.c b/extra1/Bsend.c
new file mode 100644
index 0000000..03842e2
--- /dev/null
+++ b/extra1/Bsend.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <mpi.h>
+#include <stdlib.h>
+#include <unistd.h>
+// 3 КБайта
+#define MESSAGE_SIZE (3*1024)
+#define IDX0 0
+#define IDX1 1
+
+int main(int argc, char *argv[]) {
+
+        double start_time, end_time;
+        double start_send, end_send;
+        int my_rank, commsize;
+        char *data;
+
+        MPI_Init(&argc, &argv);
+        MPI_Comm_size(MPI_COMM_WORLD, &commsize);
+        MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
+
+        if ((my_rank == 0) || (my_rank ==1)) {
+                data = (char *)malloc(sizeof(char) * MESSAGE_SIZE);
+                start_time = MPI_Wtime();
+
+                if (my_rank == 0) {
+                        start_send = MPI_Wtime();
+                        MPI_Bsend(data, MESSAGE_SIZE, MPI_CHAR, IDX1, 0, MPI_COMM_WORLD);
+                        end_send = MPI_Wtime();
+
+                        sleep(2);
+
+                        MPI_Recv(data, MESSAGE_SIZE, MPI_CHAR, IDX1, 0, MPI_COMM_WORLD, NULL);
+                }
+                else {
+                        MPI_Recv(data, MESSAGE_SIZE, MPI_CHAR, IDX0, 0, MPI_COMM_WORLD, NULL);
+
+                        start_send = MPI_Wtime();
+                        MPI_Bsend(data, MESSAGE_SIZE, MPI_CHAR, IDX0, 0, MPI_COMM_WORLD);
+                        end_send = MPI_Wtime();
+                }
+                end_time = MPI_Wtime();
+                printf("[%d]Execution time (MPI_Bsend): %f; Send time: %f\n", my_rank, end_time - start_time, end_send - start_send);
+                free(data);
+	}
+
+	MPI_Finalize();
+}
diff --git a/extra1/Rsend.c b/extra1/Rsend.c
new file mode 100644
index 0000000..3cbf25d
--- /dev/null
+++ b/extra1/Rsend.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <mpi.h>
+#include <stdlib.h>
+#include <unistd.h>
+// 16 КБайт
+#define MESSAGE_SIZE (16*1024)
+#define IDX0 0
+#define IDX1 1
+
+int main(int argc, char *argv[]) {
+
+        double start_time, end_time;
+        double start_send, end_send;
+        int my_rank, commsize;
+        char *data;
+
+        MPI_Init(&argc, &argv);
+        MPI_Comm_size(MPI_COMM_WORLD, &commsize);
+        MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
+
+        if ((my_rank == 0) || (my_rank ==1)) {
+                data = (char *)malloc(sizeof(char) * MESSAGE_SIZE);
+                start_time = MPI_Wtime();
+
+                if (my_rank == 0) {
+                        start_send = MPI_Wtime();
+                        MPI_Rsend(data, MESSAGE_SIZE, MPI_CHAR, IDX1, 0, MPI_COMM_WORLD);
+                        end_send = MPI_Wtime();
+
+                        sleep(2);
+
+                        MPI_Recv(data, MESSAGE_SIZE, MPI_CHAR, IDX1, 0, MPI_COMM_WORLD, NULL);
+                }
+                else {
+                        MPI_Recv(data, MESSAGE_SIZE, MPI_CHAR, IDX0, 0, MPI_COMM_WORLD, NULL);
+
+                        start_send = MPI_Wtime();
+                        MPI_Rsend(data, MESSAGE_SIZE, MPI_CHAR, IDX0, 0, MPI_COMM_WORLD);
+                        end_send = MPI_Wtime();
+                }
+                end_time = MPI_Wtime();
+                printf("[%d]Execution time (MPI_Rsend): %f; Send time: %f\n", my_rank, end_time - start_time, end_send - start_send);
+                free(data);
+	}
+
+	MPI_Finalize();
+}
diff --git a/extra1/Send.c b/extra1/Send.c
new file mode 100644
index 0000000..5eff503
--- /dev/null
+++ b/extra1/Send.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <mpi.h>
+#include <stdlib.h>
+#include <unistd.h>
+// 16 КБайт
+#define MESSAGE_SIZE (16*1024)
+#define IDX0 0
+#define IDX1 1
+
+int main(int argc, char *argv[]) {
+
+        double start_time, end_time;
+        double start_send, end_send;
+        int my_rank, commsize;
+        char *data;
+
+        MPI_Init(&argc, &argv);
+        MPI_Comm_size(MPI_COMM_WORLD, &commsize);
+        MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
+
+        if ((my_rank == 0) || (my_rank ==1)) {
+                data = (char *)malloc(sizeof(char) * MESSAGE_SIZE);
+                start_time = MPI_Wtime();
+
+                if (my_rank == 0) {
+                        start_send = MPI_Wtime();
+                        MPI_Send(data, MESSAGE_SIZE, MPI_CHAR, IDX1, 0, MPI_COMM_WORLD);
+                        end_send = MPI_Wtime();
+
+                        sleep(2);
+
+                        MPI_Recv(data, MESSAGE_SIZE, MPI_CHAR, IDX1, 0, MPI_COMM_WORLD, NULL);
+                }
+                else {
+                        MPI_Recv(data, MESSAGE_SIZE, MPI_CHAR, IDX0, 0, MPI_COMM_WORLD, NULL);
+
+                        start_send = MPI_Wtime();
+                        MPI_Send(data, MESSAGE_SIZE, MPI_CHAR, IDX0, 0, MPI_COMM_WORLD);
+                        end_send = MPI_Wtime();
+                }
+                end_time = MPI_Wtime();
+                printf("[%d]Execution time (MPI_Send): %f; Send time: %f\n", my_rank, end_time - start_time, end_send - start_send);
+                free(data);
+	}
+
+	MPI_Finalize();
+}
diff --git a/extra1/Ssend.c b/extra1/Ssend.c
new file mode 100644
index 0000000..a7c4a51
--- /dev/null
+++ b/extra1/Ssend.c
@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <mpi.h>
+#include <stdlib.h>
+#include <unistd.h>
+// 16 КБайт
+#define MESSAGE_SIZE (16*1024)
+#define IDX0 0
+#define IDX1 1
+
+int main(int argc, char *argv[]) {
+
+        double start_time, end_time;
+        double start_send, end_send;
+        int my_rank, commsize;
+        char *data;
+
+        MPI_Init(&argc, &argv);
+        MPI_Comm_size(MPI_COMM_WORLD, &commsize);
+        MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
+
+        if ((my_rank == 0) || (my_rank ==1)) {
+                data = (char *)malloc(sizeof(char) * MESSAGE_SIZE);
+                start_time = MPI_Wtime();
+
+                if (my_rank == 0) {
+                        start_send = MPI_Wtime();
+                        MPI_Ssend(data, MESSAGE_SIZE, MPI_CHAR, IDX1, 0, MPI_COMM_WORLD);
+                        end_send = MPI_Wtime();
+
+                        sleep(2);
+
+                        MPI_Recv(data, MESSAGE_SIZE, MPI_CHAR, IDX1, 0, MPI_COMM_WORLD, NULL);
+                }
+                else {
+                        MPI_Recv(data, MESSAGE_SIZE, MPI_CHAR, IDX0, 0, MPI_COMM_WORLD, NULL);
+
+                        start_send = MPI_Wtime();
+                        MPI_Ssend(data, MESSAGE_SIZE, MPI_CHAR, IDX0, 0, MPI_COMM_WORLD);
+                        end_send = MPI_Wtime();
+                }
+                end_time = MPI_Wtime();
+                printf("[%d]Execution time (MPI_Ssend): %f; Send time: %f\n", my_rank, end_time - start_time, end_send - start_send);
+                free(data);
+	}
+
+	MPI_Finalize();
+}
diff --git a/extra1/output b/extra1/output
new file mode 100644
index 0000000..e9611d1
--- /dev/null
+++ b/extra1/output
@@ -0,0 +1,11 @@
+[0]Execution time (MPI_Send): 2.001213; Send time: 0.000341
+[1]Execution time (MPI_Send): 2.001231; Send time: 2.000874
+
+[0]Execution time (MPI_Ssend): 2.022626; Send time: 0.000384
+[1]Execution time (MPI_Ssend): 2.022571; Send time: 2.022247
+
+[0]Execution time (MPI_Rsend): 2.018200; Send time: 0.000382
+[1]Execution time (MPI_Rsend): 2.018145; Send time: 2.017824
+
+[0]Execution time (MPI_Bsend): 2.000843; Send time: 0.000123
+[1]Execution time (MPI_Bsend): 0.000254; Send time: 0.000105