#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

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