# include <iostream>
# include <iomanip>
# include <algorithm>

using namespace std;


int main()
{
    int n, v, sum = 0;
    cin >> n;
    int num[n];
    for (int i = 0; i < n; i++) cin >> num[i];
    cin >> v;

    for (int i = 0; i < n; i++) {
        sum += num[i];
    }
    cout << sum - v << endl;
}