#include <cstdio>
#include <string>
#include <iostream>
using namespace std;

const int MAX_N = 10000;
int N, A[MAX_N], v, sum = 0;

int main(){
	cin >> N;
	for(int i = 0;i < N;i++){
		cin >> A[i];
		sum += A[i];
	}
	cin >> v;
	cout << sum - v << endl;

	return 0;
}