#include <iostream>
#include <iomanip>

using ldouble = long double;

void solve() {
    constexpr ldouble p = 0.99;

    ldouble q;
    std::cin >> q;
    q /= 10000;

    std::cout << std::fixed << std::setprecision(10)
              << (1 - p) * (1 - q) / ((1 - p) * (1 - q) + p * q) * 100
              << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}