#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <vector>
#include <map>
#include <climits>
#include <algorithm>

#define LL long long

using namespace std;

int main()
{
    int T;scanf("%d",&T);
    while(T--){
        int x,y;
        cin>>x>>y;
        cout<<x*y*2<<endl;
    }
    return 0;
}