#include<iostream>
using namespace std;
int main (){
    int n;
    cin>>n;
    if(n<1||n>10){
        cout<<"Invalid input";
        return 0;
    }
    double grade,sum = 0;
    for(int 1=0;i<n;i++){
        cin>>grade;
        if(grade<0){
            cout<<"Invalid Input";
            return 0;
        }
        sum+=grade;
    }
    double gpa= sum/n;
    if(gpa==(int)gpa)
    
       cout<<(int)gpa;
    else
       cout<<gpa;
    return 0;   
}