#include<bits/stdc++.h>
using namespace std;

int main(){
	long long a,b;
	cin>>a>>b;
	float c = (float)((b/100.0)*a);
	int d = c;
	if(c == d){
		cout<<d;
	}else{
		cout<<c;
	}
	//cout<<(b/100)*a;
}
#include <bits/stdc++.h>
using namespace std;

int main(){
    double a,b;
    double x;

    cin >> a >> b;

    x = a*b/100;
    cout << x << endl;

    return 0;
}