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