# include <iostream>
# include <fstream>
using namespace std;//4 = 24 6=25 7=30; 5-1 10-2 15-3 20-4 25-6 30-7 35-8 40-9 45-10 50-12
ifstream f1 ("fact.in");//i=1 ;5*p=30
ofstream f2 ("fact.out");
    int p,i=1,k;
    int solutie()
    { if(p*5<5^i)
        {
            return 0;
        }
        else
        {
            i++;
            solutie();
        }
    }

int main()
{
    f1>>p;
    if (p==0)
    f2 <<1;
    else
    if(p==2)
    f2<<10;
else
    {solutie();
   //cout<<p<<'\n'<<p*5<<'\n'<<i<<'\n'<<p*5-(5*i);
f2<<p*5-(5*i);}
    return 0;
}