#include <bits/stdc++.h>
using namespace std;
int main () {
	int a, b;
	cin >> a >> b;
	int c1, c2; char x;
	cin >> c1 >> x >> c2;
	a = (a + b) / 10;
	cout << a * (10 + c1 * 10 + c2) << endl;
}