#include <bits/stdc++.h>

using namespace std;

int main() {
    int n;
    cin >> n;

    int tot = 0;
    for (int i = 0; i < n; ++i) {
        int t;
        cin >> t;
        tot += t;
    }

    int v;
    cin >> v;
    
    cout << tot - v << endl;
    return 0;
}