Datasets:

slayone
/

uva_spoj_raw

#include <bits/stdc++.h>

using namespace std;

int main(){
   int v, t;
   while(scanf("%d %d", &v, &t) == 2)
      printf("%d\n", v * t * 2);
   return(0);
}

	#include <bits/stdc++.h>

	using namespace std;

	int main(){
	int v, t;
	while(scanf("%d %d", &v, &t) == 2)
	printf("%d\n", v * t * 2);
	return(0);
	}