/* 
   avg.c: find avg in input data
*/


#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main(int argc, char ** argv)
{
   int N;
   double x, count;
  
   N = 0;

   scanf("%lf\n", &x);
   count = x;

   if ( x < 1 )
   {
      printf("Warning: first value in input = %lf\n", x);
      printf("You have probably used INCORRECT input data\n");
      printf("This program computes the avg for the INPUT data files\n");
      printf("Use avg2 to compute the avg for the counting sample !\n");
      exit(1);
   }

   while ( scanf("%lf\n", &x) > 0 )
   {
      count += x;
      N++;
/*
      printf("%d  count=%d\n", j, count[j]);
*/
   }

   printf("Avg = %lf\n", count/N);
}