#include <bits/stdc++.h>
#define rep(i, ns, ne) for (ull i = ns; i < ne; ++i)
using namespace std;
using ull = unsigned long long;

int main() {
  ull N;
  ull x;
  ull ans = 0;
  cin >> N;
  rep(i, 0, N) {
    cin >> x;
    ans += x;
  }
  cout << ans << endl;
  getchar();
}