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

#define max 20

int main(){
  int array[max], i, count = 0, n;
  double avg = 0;
  printf("Vvedite n: ");
  scanf("%d", &n);
  for(i = 0; i < n; i++){
      array[i] = i + 2;
      printf("Array[%d] = %d\n", i, array[i]);
  }

  for(i = 0; i < n; i++){
    int x = 1;
    while(x < array[i])
      x *= 2;
    if (x == array[i]){
      count++;
      avg += array[i];
    }
  }

  printf ("\nSrednee = %lf\n", avg / count);

  printf("\nIzmenenie massiva:\n");
  printf("Vvedite n: ");
  scanf("%d", &n);
  for(i = 0; i < n; i++){
    printf("Array[%d] = ", i);
    scanf("%d", &array[i]);
  }

  printf ("Vivod novogo massiva:\n");
  for(i = 0; i < n; i++)
    printf("Array[%d] = %d\n", i, array[i]);

  return 1;
}