#include <iostream>

using namespace std;

int main(){
    long long p;
    cin >> p;
    long long n=0;
    if(p==0){
        cout << 1 << "\n";
        return 0;
    }
    while(p>0){
        n+=5;
        if(n%25==0){
            p--;
            if(p==0){
                break;
            }
        }
        p--;
    }
    cout << n << "\n";
}