#include<bits/stdc++.h> using namespace std; int main(){ int n; cin >> n; int a[n]; for(int i=0;i<=n-1;i++){ cin>>a[i]; } int sum; sum = 0; for (int i = 0; i <= n - 1; i++) { sum = sum + a[i]; } float p = sum * 1.0 / n; printf("%.2f", p); cout << endl; return 0; }