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1sem/programming basics/5/1_40.cpp

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+// pb_5_1_40.cpp
+// Горбацевич Андрей
+#include <iostream>
+using namespace std;
+
+int gcd (int a, int b) {
+    while (b) {
+        a %= b;
+        swap(a, b);
+    }
+    return a;
+}
+
+
+int main() {
+    int a, b, c;
+    cout << "a, b, c >>";
+    cin >> a >> b >> c;
+    cout << (gcd(gcd(a,b),c) == 1? "YES" : "NO") << endl;
+}