#include <stdio.h>
#include <stdlib.h>
#include <string.h>



double array_average(int arr[], int n) {
    // TODO: implement this function
    return 0;
}


int main(void) {
    int n;
    if (scanf("%d", &n) != 1) return 0;
    int arr[1000];
    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }
    printf("%g\n", array_average(arr, n));
    return 0;
}