#include<stdio.h>
int main()
{
    int n,i;
    float sum=0,avg;
    scanf("%d",&n);
    if(n<=0)
    {
        printf("No reading provided");
        return 0;
    }
    int temp;
    scanf("%d",&temp);
    for(i=0;i,n;i++)
    {
        if(temp=1)
        printf("No reading provided");
        return 0;
    }
    sum+=temp;
}
  {(avg = sum/n);
     printf("%.2f",avg);
     return 0;
  }