// Problem: A - kcal
// Contest: AtCoder - AtCoder Beginner Contest 205
// URL: https://atcoder.jp/contests/abc205/tasks/abc205_a
// Memory Limit: 1024 MB
// Time Limit: 2000 ms
// 
// Powered by CP Editor (https://cpeditor.org)

#include<bits/stdc++.h>
using namespace std;
#define Jai_shri_Ram ios_base::sync_with_stdio(false), cin.tie(NULL);
//#define int long long int 
#define rep(x,a,b) for(int x=a;x<b;x++)
#define deb(x) cout<< #x <<" = "<<x<<endl;

void solve(){
	int a , b ; 
	cin >> a >> b ; 
	
	double ans = 0.0 ; 
	ans = (1.0 * a * b) / 100 ; 
	cout << ans << endl ;
}

signed main(){
  Jai_shri_Ram
	solve();
}
#include <bits/stdc++.h>
using namespace std;

int main() {
    double A = 0, B = 0;
    cin >> A >> B;
    if (A==0 || B==0) {
        cout << 0 << endl;
        return 0;
    }
    cout << (B / 100) * A << endl; 
}