#include<stdio.h>
#include<string.h>
#include<string>
#include<math.h>
#include<algorithm>
#define LL long long
#define PI atan(1.0)*4
#define DD doublea
#define MAX 1010
#define mod 10007
using namespace std;
int main()
{
    int n,m,j,i,s,t;
	scanf("%d",&t);
	while(t--)
	{
		scanf("%d%d",&n,&m);
		printf("%d\n",n*m*2);
	}
	return 0;
}