#include <iostream>
#include <vector>
#include <map>
#include<string>
#include<algorithm>
#include<math.h>
#define ll long long
#define P pair<int,int>
#define lP pait<ll,ll>
using namespace std;
int main() {
    int n,v;
    int sum=0;
    cin>>n;
    vector<int> a(n);
    for(int i=0;i<n;i++){
        cin>>a[i];
        sum+=a[i];
    }
    cin>>v;
    cout<<sum-v<<endl;
    return 0;
}