/*   /\_/\
    (= ._.)
    / >0  \>1
*/
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

ll n;
int main()  
{

  ios::sync_with_stdio(false);
  cin.tie(0);
  
  cin >> n;
  cout << n * 30000 - (n / 15) * 10000;
  return 0;
}

n=int(input())
x=n*30000
y=(n//15)*10000
print(x-y)

#include <iostream>

int main() {
    int n;
    std::cin >> n;
    int x = n * 30000;
    int y = (n / 15) * 10000;
    std::cout << (x - y) << std::endl;
    return 0;
}