#define _USE_MATH_DEFINES

#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max,count
#include <string>	//string
#include <ios>		//fixed
#include <iomanip>	//setprecision
#include <utility> //swap
#include <cstdlib>	//abs(int)
#include <cmath>	//sqrt
#include <sstream>	//stringstream,getline
#include <cmath>	//ceil,M_PI

using namespace std;

int main() {

	int N;
	cin >> N;

	int A = 0;
	int temp = 0;
	for (int i = 0; i < N; i++) {
		cin >> temp;
		A += temp;
	}

	int v;
	cin >> v;

	cout << A - v << endl;

	return 0;

}