#include <iostream>
using namespace std;

int main() {
    int x;
    cin >> x;
    
    if((x + 0) % 4 == 0) {
        cout << 0 << endl;
    }
    else if((x + 1) % 4 == 0) {
        cout << 9 << endl;
    }
    else if((x + 2) % 4 == 0) {
        cout << 18 << endl;
    }
    else {
        cout << 27 << endl;
    }
    return 0;
}