#include <iostream>
#include <algorithm>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <cstdlib>
#include <queue>
#include <stack>
#include <list>
#include <set>
#include <map>
#include <vector>
#define ll long long
using namespace std;
int i, j, k, g, n, m, re;
int t, tt, res, ans, temp, pos, flag;
int main()
{
    scanf("%d",&re);
    while(re--)
    {
        int a,b;
        scanf("%d%d",&a,&b);
        printf("%d\n",2*a*b);
    }
    return 0;
}