#include <iostream>

using namespace std;

int main()

{

    int N, score;

    while(cin>>N)

    {

        if(N >= 40)

            cout << 100;

        else if(N >= 20)

            cout << 60 + N;

        else if(N > 10)

            cout << 40 + 2*N;

        else

            cout << 6*N;

        cout << endl;

    }

    return 0;

}