#include<stdio.h>
  int main()
{
   long long n, k;
freopen("sarpe.in", "r", stdin);
freopen("sarpe.out", "w", stdout);

scanf("%lld", &n);
if(n>1)
k=n*n+n+2;
else
k=2;

printf("%lld", k);



return 0;
}