#include <iostream>
#include <math.h>

// This program computes the sum of the first n numbers, e.g.,
// when n = 5, the sum is 5+4+3+2+1 = 15
//
// The sum is computed for n = 5, 10, 15, ..., 50
int main()
{
	long int i, j, total;


	for (i = 5; i<=50; i += 5)
	{
		total = 0;
		for (j = 1; j<=i; j++)
		{
			total += j;
		}
		cout << "The sum of the first " << i << " numbers is " << total << endl;
	}
}