// editor2
#include <iostream>
using namespace std;
int main(){
    int n;
    cin>>n;
    try {
        if(n<1||n>12){
            throw "Invalid input";
        }
        int deposit,saving=0;
        for (int i=0;i<=n;i++){
            cin>>deposit;
        }
        if (deposit>1000){
            throw "Invalid input";
        }
        saving+=deposit;
    }
    catch (const char *a){
        cout<<a;
    }
    cout<<savings;
    return 0;
}