#include <iostream>
using namespace std;
using ll = long long;

int main() {
    int n;
    cin >> n;
    int sum = 0;
    for(int i=0; i<n; ++i) {
        int a;
        cin >> a;
        sum += a;
    }
    int v;
    cin >> v;
    cout << sum - v << endl;
}