#include <stdio.h>
int PF(int i)
{
 i=i*i*i;
 return i;
}
int main(void) {
	// your code goes here
    int n,j,sum=0;
    scanf("%d",&n);
    for(j=1;j<=n;j++)
    {
     sum=PF(j)+sum;
    }
    printf("累加立方和为：%d\n",sum);
	return 0;
}