#include<iostream>
#include<exception>
using namespace std;

int main ()
{
    int n,i,a;
    double sum=0;
    double avg=0;
    cout<<"\nEnter the no of elements:"<<endl;
    try {
        cin>>n;
        if (n <= 0) throw invalid_argument("n must be positive");
        for(i=0;i<n;i++)
        {
            cout<<"Enter the number"<<i+1<<": ";
            cin>>a;
            sum=sum+a;
        }
        avg = sum / n;
        cout<<"Avg of "<<n<<" numbers : "<<avg<<endl;
    }
    catch (exception& e) {
        cout<<"Error: "<<e.what()<<endl;
    }
    return 0;
}