#include <cstdio>
using namespace std;

int main()
{
    freopen("fact.in","r",stdin);
    freopen("fact.out","w",stdout);
    int p,r;
    scanf("%d",&p);
    if(p==0)
        printf("1");
    else{
        r=p*5-(p/10)*5;
        printf("%d",r);
    }
    return 0;
}