#include<iostream>
using namespace std;

int main(){
    int n;
    cin>> n;
    if(n<=0 || n> 12){
        cout << "Invalid input";
        return 0;
    }
    int deposit;
    int total = 0;
    
    for(int i=0; i,n; i++){
        cin>>deposit;
        if(deposit < 0 || deposit > 1000){
            cout <<"Invalid input";
            return 0;
        }
        total+=deposit;
    }
    cout<<total;
    return 0;
}