#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
#include <string>
#include <algorithm>
#include <iomanip>
using namespace std;
typedef long long ll;

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	double v;
	ll t;
	cin >> v >> t;

	ll lv = 1000 * v;

	cout << ll(lv * t / 1000) << endl;
}