#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <array>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
#include <memory>
#include <regex>
using namespace std;

int main()
{
    double p, q;
    cin >> p >> q;
    p /= 100.0;
    q /= 100.0;

    double x = p * q;
    double y = (1.0 - p) * (1.0 - q);
    double ans = x / (x + y);
    ans *= 100.0;
    printf("%.10f\n", ans);

    return 0;
}