#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define repp(i, n) rep(i, 0, n)
#define repb(i, a, b) for(int i = a; i >= b; i--)
#define all(a) a.begin(), a.end()
#define int long long
using namespace std;
typedef pair<int, int> P;

signed main(){
    int n;
    cin >> n;
    vector<int> a(n);
    int sum = 0;
    rep(i, 0, n){
        cin >> a[i];
        sum += a[i];
    }
    int v;
    cin >> v;
    cout << sum - v << endl;
}