#include<stdio.h>
float findaverage(int arr[],int n)
{
    if(n==0)
    {
        return -9999;
    }
    int sum=0;
    for(int i=0;i<n;i++)
    {
        sum+=arr[i];
    }
    return(float)sum/n;
}
int main()
{
    int n;
    scanf("%d",&n);
    if(n==0)
{
 printf("NO readings provided");
 return 0;
}
int arr[n];
for(int i=0;i<n;i++)
{
    scanf("%d",&arr[i]);
}
    float avg=findaverage(arr,n);
    if(avg==-9999)
    {
        printf("NO reaging provided");
    }
    else
    {
        printf("%.2f",avg);
        if(n==0)
        {
            return -9999;
        }
        int sum=0;
        for(int i=0;i<n;i++)
        {
            sum+=arr[i];
        }
        return(float)sum/n;
    }
    int main()
    {
        int n;
        scanf("%d",&n);
        if(n==0)
        {
            printf("No reading provided");
            return o;
        }
        int arr[n];
        for(int i=0;i<n;i++)
        {
        scanf("%d",&arr[i]);    
        }
        float avg=findaverage(arr,n);
        if(avg==-9999)
        {
            printf("NO reading providing");
        }
        else
        {
            printf("%.2f",avg);
    }
    return 0;
}