#include <stdio.h>
#include <math.h>
int main(){
  int t;
  double v;
  double ans,ans2;
  long int a;
  scanf("%lf %d",&v,&t);
  v=v*10000;
  ans=v*t;
  ans=ans/10000;
  a=(long int)ans;
  printf("%ld\n",a);
  return 0;
}