text: #include <stdio.h>
  #include <stdlib.h>
  
  static int sum(int n)
  {
  	int i, result = 0;
  
  	for (i = 1; i <= n; ++i)
  		result += i;
  	return result;
  }
  
  int main(int argc, char **argv)
  {
  	printf("%d\n", sum(5));
  	printf("%d\n", sum(100));
  	return 0;
  }
  
  /*
   * check-name: sum from 1 to n
   * check-command: sparsei $file
   *
   * check-output-start
  15
  5050
   * check-output-end
   */
  