#include <bits/stdc++.h>
using namespace std;

int main(){
    int i, N;
    cin >> N;
    vector<unsigned long long> v(N);
    for (i=0; i<N; i++){
        cin >> v.at(i);
    }
    unsigned long long sum = accumulate(v.begin(), v.end(), 0LL);
    
    cout << sum << endl;
    return 0;
}