#include"cstdio"
#include"queue"
#include"cmath"
#include"stack"
#include"iostream"
#include"algorithm"
#include"cstring"
#include"queue"
#include"map"
#include"vector"
#define ll long long

using namespace std;
const int MAXN = 1e5+50;
const int MAXE = 200500;
const int INF = 0x3f3f3f;

int main(){
    //freopen("in.txt","r",stdin);
    int T;scanf("%d",&T);
    while(T--){
        int x,y;scanf("%d%d",&x,&y);
        cout<<x*y*2<<endl;

    }
    return 0;
}