#include <bits/stdc++.h>
using namespace std;
int main(){
    int a,b;
    cin >> a >> b;
    if(b == 1){
        if(a == 1){
            cout << 100.0000000000000000 << endl;
            return 0;
        }else{
            cout << 0.0000000000000000 << endl;
            return 0;
        }
    }
    if(a == b){
        cout << setprecision(10) << 1.0 / b << endl;
        return 0;
    }
    cout << setprecision(10) << (b / a) / b << endl;
    return 0;
}