include [HTML_REMOVED]
using namespace std;
int Sum(int a);
int main(void) {
int m, n,sum1,sum2,sum;
cin >> n >> m;
sum1 = Sum(m);
sum2 = Sum(n);
sum = sum1 * sum2;
cout << sum << endl;
return 0;
}
int Sum(int a) {
int remain, sum = 0;
while (a != 0) {
remain = a % 10;
sum += remain;
a = a / 10;
}
return sum;
}