diff --git a/seminar02_encapsulation/1number/number.cpp b/seminar02_encapsulation/1number/number.cpp
index 1950874..666e55f 100644
--- a/seminar02_encapsulation/1number/number.cpp
+++ b/seminar02_encapsulation/1number/number.cpp
@@ -151,6 +151,8 @@ Number Number::operator*(const Number & right) const
 	size << ")" << " " << "arg2=" << right << "(capacity=" << right.
 	capacity << ",size=" << right.size << ")" << std::endl;
 #endif
+    if (*this == Number("0") || right == Number("0"))
+            return Number("0");
     int i, j;
     int temp;
     Number result;