diff --git a/cpu/cuda.c b/cpu/cuda.c
new file mode 100644
index 0000000..4704943
--- /dev/null
+++ b/cpu/cuda.c
@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <math.h>
+#define THR 32
+#define MEM 128
+#define REG 2
+#define MAXTHR 1536
+#define MAXMEM 49152
+#define MAXREG 32768
+
+
+int check_use(int x, const int frac);
+
+int main() {
+	int reg, thr, mem;
+	int nbreg, nbmem, nbthr;
+	int nthr;
+	int min = 0;
+
+	freopen("cuda.in", "r", stdin);
+#ifndef _DEBUG
+	freopen("cuda.out", "w", stdout);
+#endif
+	scanf("%d %d %d", &thr, &reg, &mem);
+
+	nthr = check_use(thr, THR);
+	nbthr = (int) MAXTHR / nthr;	
+	nbreg = (int) MAXREG / (nthr*check_use(reg, REG));
+	nbmem = (int) MAXMEM / check_use(mem, MEM);
+	
+
+	if ((nbthr <= nbreg) && (nbthr <= nbmem))
+		min = nbthr;
+	else if ((nbreg <= nbthr) && (nbreg <= nbmem))
+		min = nbreg;
+	else if ((nbmem <= nbthr) && (nbmem <= nbreg))
+		min = nbmem;
+#ifdef _DEBUG
+	printf("used: %d %d %d\n", check_use(thr, THR), nthr*check_use(reg, REG), check_use(mem, MEM));
+	printf("By threads: %d, by registers: %d, by memory: %d\n", nbthr, nbreg, nbmem);
+#endif
+	printf("%d", (int)round((thr*min*100)/(double)MAXTHR));
+	return 0;
+}
+
+int check_use(int x, const int frac) {
+	int real_x = frac;
+	while (1) {
+		real_x += frac;
+		if (real_x >= x) {
+			x = real_x;
+			break;
+		}
+	}
+#ifdef _DEBUG
+	printf("%d %d\n", x, real_x);
+#endif
+	return x;
+}
diff --git a/cpu/pdp_rw.c b/cpu/pdp_rw.c
new file mode 100644
index 0000000..5274d3a
--- /dev/null
+++ b/cpu/pdp_rw.c
@@ -0,0 +1,46 @@
+#include <stdint.h>
+#include <stdio.h>
+typedef uint8_t byte;
+typedef uint16_t word;
+typedef uint16_t adr;
+
+byte mem[1 << 16];
+
+byte b_read (adr a) {
+	return mem[a];
+}
+void b_write (adr a, byte val) {
+	mem[a] = val;
+}
+word w_read  (adr a) {
+	return *(word*)&mem[a];
+}
+void w_write (adr a, word val) {
+	*(word*)&mem[a] = val;
+}
+void load_file() {
+	adr a;
+	int n, i;
+	byte x;
+
+	while(scanf("%hx %x", &a, &n) != EOF) {
+		//printf("%x", n);
+		for (i = 0; i < n; ++i) {
+			//printf("number %d\n", i);
+			scanf("%hhx", &x);
+			b_write(a+i, x);
+			//printf("Read %hx\n", mem[a+2*i]);
+		}
+	}
+}
+
+void mem_dump(adr start, word n) {
+	for (int i = 0; i < n; i+=2) {
+		//printf("%d:read from %hx: %hx\n", i,start+i, *(word*)&mem[start+i]);
+		printf("%06ho : %06ho\n", start+i, *(word*)&mem[start+i]);
+	}
+}
+//int main() {
+//	load_file();
+//	mem_dump(0x40, 4);
+//}
diff --git a/cpu/simple_page.c b/cpu/simple_page.c
new file mode 100644
index 0000000..e04de79
--- /dev/null
+++ b/cpu/simple_page.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main() {
+	unsigned N, i, page_n, log;
+	
+	scanf("%u", &N);
+	unsigned *mem = (unsigned*)calloc(N, sizeof(unsigned));
+	for (i = 0; i < N; ++i) {
+		scanf("%x", &mem[i]);
+	}
+
+	scanf("%x", &log);
+	page_n = (log >> 26) & 0b111111;
+	if (page_n < N) {
+		printf("%x", mem[page_n]+(log << 6 >> 6));
+	}
+	else {
+		printf("error");
+	}
+
+
+	free(mem);
+	return 0;
+
+
+}