#include <stdio.h>

int main() {
  int n; 
  scanf ("%d",&n);
  int sum =0;
  float avg ;
  int arr[n];
  for (i=;i<n;i++){
      scanf ("%d",&arr[i]);
  }
  for (i=0;i<n;i++){
      sum=sum +arr[i];
      }
      ava=sum/n;
      printf ("avg:%,2f\n",avg );
      return 0;
    }