#include <bits/stdc++.h>

using namespace std;

int main() {
    long long l, s;
    cin >> l;
    if (l > 1000000) {
        s = 100000 * 0.1 + (200000 - 100000) * 0.075 + (400000 - 200000) * 0.05 + (600000 - 400000) * 0.03 +
            (1000000 - 600000) * 0.015 + (l - 1000000) * 0.01;
    } else if (l > 600000 && l <= 1000000) {
        s = 100000 * 0.1 + (200000 - 100000) * 0.075 + (400000 - 200000) * 0.05 + (600000 - 400000) * 0.03 +
            (l - 600000) * 0.015;
    } else if (l > 400000 && l <= 600000) {
        s = 100000 * 0.1 + (200000 - 100000) * 0.075 + (400000 - 200000) * 0.05 + (l - 400000) * 0.03;
    } else if (l > 200000 && l <= 400000) {
        s = 100000 * 0.1 + (200000 - 100000) * 0.075 + (l - 200000) * 0.05;
    } else if (l > 100000 && l <= 200000) {
        s = 100000 * 0.1 + (l - 100000) * 0.075;
    } else {
        s = l * 0.1;
    }
    printf("%lld", s);
    return 0;
}