#include <iostream>
using namespace std;
int main() {
int N;
cin >> N;
int score = 0;
if (N <= 10) {
score = N * 6;
} else if (N <= 20) {
score = 10 * 6 + (N - 10) * 2;
} else if (N <= 40) {
score = 10 * 6 + 10 * 2 + (N - 20) * 1;
} else {
score = 100;
}
cout << score << endl;
return 0;
}