#include <iostream>

using namespace std;

int main(){

  int n, score;

  while (cin >> n){

    if (n<=10) score=n*6;

    else if (n<=20) score=60+((n-10)*2);

    else if (n<=39) score=80+(n-20);

    else if (n>=40) score=100;

    cout << score <<endl;

  }

}