#include<bits/stdc++.h>
using namespace std;

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