#include <iostream>
int main() {
    int N;
    std::cin >> N;
    int* A = new int[N];
    for(int i = 0;i < N;i++){
        std::cin >> A[i];
    }
    
    int Sum = 0;
    for(int i = 0;i < N;i++){
        Sum+=A[i];
    }
    
    double Avg = (double)(Sum / N);
    
    std::cout << Avg << std::endl;
    
    return 0;
}