#include <iostream>
#include <cstdint>
#include <vector>

using namespace std;

int main() {

    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;
    int tAns = 0;
    vector<int> vec(n);
    for (auto& i : vec) {
        cin >> i;
        tAns += i;
    }
    int v;
    cin >> v;
    cout << tAns - v << endl;
    return 0;
}