#include <bits/stdc++.h>
#define PI 3.14159265359
using namespace std;
const int64_t MOD = 1e9 + 7;

int main() {
	double v;
	int t;
	cin >> v >> t;

	v *= 10000+0.5;
	//cout << v << endl;
	int vt = v;
	//cout << vt << endl;
	int d =vt * t;
	d /= 10000;

	cout << d << endl;
}