#include<iostream>
using namespace std;

int main()
{
	int n;
	cin >> n;
	if (n <= 100000)cout << n*0.1 << endl;
	else if (n > 100000 && n <= 200000)cout << 100000 * 0.1 + (n - 100000)*0.075 << endl;
	else if (n > 200000 && n <= 400000)cout << 100000 * 0.1 + 100000 * 0.075 + (n - 200000)*0.05 << endl;
	else if (n > 400000 && n <= 600000)cout << 100000 * 0.1 + 100000 * 0.075 + 200000 * 0.05 + (n - 400000)*0.03 << endl;
	else if (n > 600000 && n <= 1000000)cout << 100000 * 0.1 + 100000 * 0.075 + 200000 * 0.05 + 200000 * 0.03 + (n - 600000)*0.015 << endl;
	else cout << 100000 * 0.1 + 100000 * 0.075 + 200000 * 0.05 + 200000 * 0.03 + 400000 * 0.015 + (n - 1000000)*0.01 << endl;
	return 0;
}