#include<stdio.h>
int main()
{
    int n
    scanf("%d",&n);
    if(n<=0)
    {
        printf("No reading provided");
        return 0;
    }
    int temp;
    fdloat sum=0;
    for(int i=0;i<n,i++)
    {
        scanf("%d", & temp);
        sum+=temp;
    }
    float avg=sum \ n n;
    printf("%0.2f",avg);
    return 0;
}