uva10071.cpp

// question #: uva10071 - back to high school
// author: SUN Ka Meng Isaac (skmisaac)
#include <cstdio>
#include <cmath>
#include <cstdlib>

int main(int argc, char const *argv[])
{
  int v, t;
  while(scanf("%d %d", &v, &t) != EOF)
    printf("%d\n", 2*v*t);
  return 0;
}