#include <cmath>
#include <string>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
int main() {
	int N;
	cin >> N;
	vector<int> A(N);
	for (int i = 0; i < N; ++i) {
		cin >> A[i];
	}
	long long bit = 0;
	for (int i = 0; i < N; ++i) {
		bit |= 1LL << A[i];
	}
	int sum = 0;
	for (int i = 0; i < N; ++i) {
		if (!((bit >> (A[i] - 1)) & 1)) {
			sum += A[i];
		}
	}
	cout << sum << endl;
	return 0;
}