// Add the missing include we need to do I/O functions with:
#include <stdio.h>

/**
 * Create the missing sum function that takes 4 integer values and returns
 * the sum of those 4 values as it's return value:
 */
int sum(int a, int b, int c, int d)
{
  return a + b + c + d;
}


int main(void)
{
  // Define the missing integer variable n:
  int n;
  
  printf("Enter an integer: ");
  scanf("%d", &n);
  printf("%d + %d + %d + %d = %d\n",
	   n, n+1, n+2, n+3,  sum(n, n+1, n+2, n+3));

  // Add the return value for main:
  return 0;
}