#include <bits/stdc++.h>
using namespace std;
using ll = long long;
//#define int long long
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
//g++ a.cpp
//./a.out
//oj d https://atcoder.jp/contests/abc205/tasks/abc205_a
//oj t

int main(){
    double a, b;
    cin >> a >> b;
    double c;
    c = a / 100;
    double d;
    d = c * b;
    cout << d << endl;
}
#include <bits/stdc++.h> 

using namespace std;

int main(){
    double a,b;cin>>a>>b;
    cout<<(a/100)*b;
    return 0;
}