#include <bits/stdc++.h>
using namespace std;
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	double A, B; cin >> A >> B; 
	cout.precision(10); 
	cout << A * B * 0.01 << "\n"; 
}
#include <iostream>
#include <stdio.h>
#include <algorithm>
using namespace std;
typedef long long ll;

int A, B;

int main(int argc, const char * argv[]) {
    // insert code here...
    scanf("%d %d", &A, &B);
    
    double ans = (double)(A * B) / 100;
    
    printf("%f", ans);
    return 0;
}