#include <iostream>
using namespace std;

int main() {
    double x, n = 0;
    cin >> x;

    if (x > 1000000) {
        n += (x - 1000000) * 0.01;
        x = 1000000;
    }
    if (x > 600000) {
        n += (x - 600000) * 0.015;
        x = 600000;
    }
    if (x > 400000) {
        n += (x - 400000) * 0.03;
        x = 400000;
    }
    if (x > 200000) {
        n += (x - 200000) * 0.05;
        x = 200000;
    }
    if (x > 100000) {
        n += (x - 100000) * 0.075;
        x = 100000;
    }

    n += x * 0.1;

    cout << n;

    return 0;
}