#include <bits/stdc++.h>

using namespace std;

#define INF 2000000000
#define MOD 1000000007
typedef long long ll;
typedef pair<int, int> P;


int main()
{
	double v, t;
	cin >> v >> t;
	double vv = v * 10000;
	double ans = vv * t;
	string s = to_string(ans);
	int size = s.size();
	if (size-11<=0) {
		cout << 0 << "\n";
		return 0;
	}
	for (int i = 0; i < s.size()-11; i++) {
		cout << s[i];
	}
	cout << "\n";

}