#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)

using std::cin;
using std::cout;
using std::vector;

int main() {
	int t;
	cin >> t;
	
	while (t--) {
		int a, b;
		cin >> a >> b;
		int ans = (a + 1) * b;
		cout << ans << '\n';
	}
	
	return 0;
}