#include <vector>
#include <set>
#include <map>
#include <iostream>
#include <algorithm>
using namespace std;
typedef long long int ll;
typedef pair<int, int> pii;

#define REP(i,x) for(int i=0;i<(int)(x);i++)

int main(){
    string s;
    int t;
    cin >> s >> t;
    ll v = 0;
    v += (s[0] - '0') * 10000;
    v += (s[2] - '0') * 1000;
    v += (s[3] - '0') * 100;
    v += (s[4] - '0') * 10;
    v += (s[5] - '0') * 1;
    ll dist = (v * t)/(10000);
    cout << dist << endl;
    return 0;
}