#include <iostream>

using namespace std;

int main() {
	
	int n;
	cin >> n;
	long int sum = 0;
	for(int i = 0; i < n; i++) {
		int a;
		cin >> a;
		
		sum += a;
	}
	int yu;
	cin >> yu;
	cout << sum - yu;
	
}