#include<stdio.h>
float average_temprature(int count,int tempratures[]){
    if(count==0){
        printf("No readings provided");
        return 0;
    }
    float sum=0;
    for(int i=0;i<count;i++){
        sum+=temperatures[i];
    }
    printf("%.2f",sum/count);
    return sum/count;
}
int main(){
    int n;
    scanf("%d",&n);
    int temps[n];
    for(int i=0;i<n;i++){
        scanf("%d",&temps[i]);
    }
    average_temperature(n,temps);
    return 0;
}