#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <math.h>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>
#include <iomanip>
using namespace std;

#define ll long long
#define INF (1 << 30)
#define INFLL (1LL << 60)

int main() {
	double speed;
	int v,s,ans;

	cin >> speed >> s;
	cout << fixed << setprecision(0);
	//cout << speed * 10000 * s / 10000 << endl;
	ans = speed * 10000 * s + 0.1;
	cout << ans / 10000<< endl;
	return 0;
}