#include <fstream>

using namespace std;

long long int p;
int res = 1;

void read()
{
    ifstream f("fact.in");
    f>>p;
    f.close();
}

void solution()
{
    res = p*5;
    if(p > 2) res -= 5;;
}

void write()
{
    ofstream g("fact.out");
    g<<res;
    g.close();
}



int main()
{
    read();
    solution();
    write();
    return 0;
}