#include<stdio.h>
int main(){
    int n;
    float avg,sum=0;
    scanf("%d",&n);
    int score[n];
    for(int i=0;i<n;i++)
    {
        scanf("%d",&score[i]);
        printf("%d ",score[i]);
        return 0;
    }
    if(score[i]<0 || score[i]>1)
    {
        printf("Invalid input");
        return 0;
    }

    
        for(int i=0;i<n;i++)
        {
            sum+=score[i];
        }
            avg=(sum/n);
           printf("%.2f",avg);
           return 0;
}