#include <iostream>
#include <iomanip>
using namespace std;

int main() {
    int c, d;
    cin >> c >> d;
    double mortality = (static_cast<double>(d)/c) * 100;
    cout << fixed << setprecision(3) << mortality << "%" << endl;
    
}
// 64 位输出请用 printf("%lld")