#include<stdio.h>
#include<stdlib.h>
#include<math.h>

double summation(long* N);

int main(void)
{
    printf("summation of squares of first N numbersn");
    printf("enter Nn");
    long* N;
    *N = 0;

    scanf("%lin",N);

    double su;
    su = summation(N);
    printf("The summ equals %.lfn", su);
    return 0;
}

double summation(long* N)
{
    double S = 0;
    int i;

    for (i = 1; i <= *N; i++)
        S = S + pow(i, 2);
    return S;
}

long* N;
*N = 0;
scanf("%lin", N);

long N;
N = 0;            // this is somewhat useless BTW, because N will be modified in the line below
scanf("%lin", &N);