#include <stdio.h>
#define LEN 5

int main ( void ) {
  double list[LEN], sum=0;
  int i;

  /* input the numbers */
  printf("Please enter five numbers:\n");
  for( i=0; i<LEN; i++ ) {
    scanf("%lf", &list[i]);
  }

  /* calculate the average */
  for( i=0; i<LEN; i++ ) {
    sum += list[i];
  }

  /* output the average */
  printf("The average is %g.\n", sum/LEN );

  return 0;
}