#include "bits/stdc++.h"

using namespace std;

using ll = long long;
using ld = long double;

const double PI = 3.1415926535897932384626433832795;

const int dx[] = { 0, 1, 0, -1 };
const int dy[] = { -1, 0, 1, 0 };

int gcd(int x, int y) { return y ? gcd(y, x % y) : abs(x); }
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : abs(x); }
int lcm(int x, int y) { return x / gcd(x, y) * y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

int main() {
	//ios::sync_with_stdio(false);
	//cin.tie(0);

	// case: b b?
	// p * q
	// case: w b? 
	// (1 - p) * (1 - q)

	double p, q;
	cin >> p >> q;

	double ans =
		100 * p * q
			/
		(p * q + (100 - p) * (100 - q));

	printf("%.13lf\n", ans);
	return 0;
}