#include<fstream>
using namespace std;
ifstream in("fact.in");
ofstream out("fact.out");

int main()
{
    long long n;
    in>>n;
    if (n==2) {out<<10;return 0;}
    if(n==1) {out<<5;return 0;}
    if(n==0) {out<<1;return 0;}
    out<<(n*5)-5;
    return 0;
}