#include <bits/stdc++.h>
using namespace std;
#define rep(i,l,r) for(int i=(l);i<(r);++i)
typedef long long ll;

int main(){
	int t; cin>>t;
	rep(i,0,t){
		int a,b; cin>>a>>b;
		cout<<a*b+b<<endl;
	}
}