#include <iostream>
#include <bits/stdc++.h>
#include <time.h>
#include <sys/timeb.h>
#include <cstdio>
#include <sys/time.h>

using namespace std;
#define ll long long
#define uint unsigned int
#define ulong unsigned long long int

template<typename T> bool InRange(T t, T l, T r){ return l <= t && t < r; }
vector<string> split(string src, char delim = ' '){
	vector<string> ret;
	int r = 0;
	int N = src.length();
	for(int l=0;l<N;l++){
		r = l;
		while(r < N && src[r] != delim) r++;
		ret.push_back(src.substr(l, r - l));
		l = r;
	}
	return ret;
}

int main(){
	
	long double P, Q;
	cin >> P >> Q;
	P /= 100.0;
	Q /= 100.0;
	cout << 100.0 * P * Q /(P * Q +  (1 - P) * (1 - Q)) << endl;
	
	
	
	
	
	
    return 0;
}