break kore na ken?

#include <bits/stdc++.h>
using namespace std;
#define debug(x) cout << #x << " = " << (x) << endl;
#define LL long long
int main(){
    unsigned LL int x;
    unsigned LL int m;
    while(scanf("%d %d", &x, &m)){
        if(x == 0 && m == 0) break;
        unsigned LL int n = x * m;
        printf("%d\n", n);
    }
    return 0;
}