#include <iostream>
#include <string>
#include <algorithm>
#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
int main() {
	long double p, q;
	cin >> p >> q;
	long double h = 100;
	long double sum = p * q + (h - p) * (h - q);
	cout << fixed << setprecision(16) << (p * q) / sum * 100 << endl;
}