/* -*- coding: utf-8 -*-
 *
 * 2835.cc:  No.2835 Take and Flip - yukicoder
 */

#include<cstdio>
#include<algorithm>

using namespace std;

/* typedef */

using ll = long long;

/* main */

int main() {
  int n;
  scanf("%d", &n);

  ll sum = 0;
  for (int i = 0; i < n; i++) {
    int ai;
    scanf("%d", &ai);
    sum += ai;
  }

  printf("%lld\n", sum);

  return 0;
}