#include <iostream>

using namespace std;

const int MAX_N = 500000;
int N;
unsigned long int A[MAX_N];

int main(){
    cin >> N;
    for (int i=0; i<N; i++){
        cin >> A[i];
    }

    unsigned long int ans = 0;
    for (int i=0; i<N; i++){
        ans += A[i];
    }
    cout << ans << endl;
}