#include <iostream>
#include <stdio.h>
using namespace std;
int main()
{
    int i,n,a;
    double o=0;
    cin>>n;
    for(i=1;i<=n;i++)
    {
        cin>>a;
        o+=a;
    }
    o/=n;
    fprintf(stdout,"%.6lf ",o);
    cout<<endl;
    return 0;
}

Edited by author 07.04.2009 21:17

Edited by author 08.04.2009 12:58