int gcd(int a, int b) {
   while (b != 0) {
   int temp = b;
   b = a % b;
   a = temp;
   }
   return a;
   }
   int gcd3(int a, int b, int c) {
   return gcd(gcd(a, b), c);
   }
   int main() {
   int m, n, o;
   scanf("%d%d%d", &m, &n, &o);
   printf("%d\n", gcd3(m, n, o));
   return 0;
   }