#include<iostream>
using namespace std;
int main(){
    int n;
    int arr[];
    int sum =0;
    cin >> n;
    if(n >= 0){
    for(int i=0;i<n;i++){
        cin >> arr[i];
    }
     
    for(int i=0;i<n;i++){
       
       sum += arr[i];
            //cout << sum;

      
    }
     cout << sum;
    }else{
        cout << "Invalid input";
    }
    
    
}