#include <stdio.h>
main()
{
     float x, sum;
     int count;
     
     sum = 0.0;
     count = 0;
     
     while ( scanf( "%f", &x ) != EOF ) {
          if ( x <= 0.0 )
               continue;  /* skip nonpositive input */
          sum += x;
          count++;
     }
     
     if ( count > 0 ) /* any positive numbers read? */
          printf( "\naverage = %f\n", sum / count );
     else
          printf( "\nno positive numbers read\n" );
}