#include <iostream>

double media() {
    int i,n;  
    cin >> n;
    float*  x = new float[n];
    double sum;

    sum = 0;
    for ( i = 0; i < n; i++) {
        cin >> x[i] ;
        sum += x[i];
    }
    return sum/n;
    delete [] x;
}