#include <stdio.h>

int main()
{
	int a, b;
	int result;

	printf("enter two numbers:\n");
	scanf("%d %d", &a, &b);

	result = sum_numbers(a, b);
	printf("result = %d\n", result);
}




int sum_numbers(int b, int a)
{
	int i;
	int sum = 0;

	for (i = b; i <= a; i++)
	{
		sum = sum + i;
	}

	return sum;
}