#include <bits/stdc++.h>
#pragma GCC optimize ("Ofast")
#define ll long long
#define ull unsigned long long
#define pll pair<long long,long long>
#define pii pair<int,int>
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define forn(i, n) for(int i=0; i<int(n); i++)
#define Forn(i, n) for(int i=1; i<=int(n); i++)

using namespace std;

int main()
{
    cin.tie(0); ios_base::sync_with_stdio(false);
    double a,b;
    cin >> a >> b;
    cout << fixed << setprecision(8) << a*b/100.0 << endl;
}

#include<iostream>
using namespace std;
int main()
{
    float a,b;
    cin >> a;
    cin >> b;
    cout << a*(b/100);
    return 0;
}