#include<stdio.h>
int main(){

      int n;
      int sum;
      scanf("%d",&n);
      if (n<1){
        sum=0;
        }else
        
        {
        sum = (n*(n+1)*(2*(n+1))/6;
        
      }
      
      printf("%d\n",sum);
      
      return 0;
      
      }