#include <iostream>
#include <algorithm>
using namespace std;
using i64 = long long;

int main(void) {
  long double v, t; scanf("%Lf%Lf", &v, &t);
  v *= 10000000000L;
  long double vt = v * t;
  i64 res = i64(vt / 10000000000L);
  printf("%lld\n", res);
  return 0;
}
// 0.0031 10000