#include <stdio.h>

int main(void)
{
	int count, sum, max;

	printf("Sum of [0;x[.\nDefine x: ");
	scanf("%d", &max);

	// assignment statement
	count = 0;
	sum = 0;
	// while
	while (count++ < max)
		// statement
		sum = sum + count;
	// function statement
	printf("sum = %d\n", sum);
	return 0;
}