#include <bits/stdc++.h>
using ll = long long;
using llu = long long unsigned;

using namespace std;

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

    int correct = accumulate(A.begin(), A.end(), 0);
    int result = correct - v;
    cout << result << endl; return 0;
}