#include <stdio.h>

int main(void)
{
    int i, j, inputN, sum, small_sum;

    printf("input num: ");
    scanf("%d", &inputN);

    sum = 0;

    for(i = 1; i <= inputN; i++)
    {
        small_sum = 1;
        for(j = 1; j <= i; j++)
            small_sum *= i;
        sum += small_sum;
    }

    printf("sum = %d", sum);

	return 0;
}