Datasets:

slayone
/

uva_spoj_raw

#include <iostream>

using namespace std;

int main(){
    int v, t;
    while(true){
        cin >> v >> t;
        if(cin.fail()) break;
        cout << v*t*2 << endl;
    }
    return 0;
}

	#include <iostream>

	using namespace std;

	int main(){
	int v, t;
	while(true){
	cin >> v >> t;
	if(cin.fail()) break;
	cout << vt2 << endl;
	}
	return 0;
	}