#include <iostream>
using namespace std;
int main()
{
int v,t;
while(cin>>v && cin>>t)
{
cout<<v*t*2<<endl;
}
return 0;
}#include <iostream>
using namespace std;
int main()
{
int v,t;
while(cin>>v && cin>>t)
{
cout<<v*t*2<<endl;
}
return 0;
}
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