#11695: C++解答
CherryChen
(방탄소년단♥김남준)
#include <iostream>
using namespace std;
int main() {
int t,v;
while(cin>>t>>v){
cout<<(t*2)*v<<endl;
}
}
#include <iostream>
using namespace std;
int main() {
int t,v;
while(cin>>t>>v){
cout<<(t*2)*v<<endl;
}
}