#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using ll=long long;
using vll=vector<ll>;
using pll=pair<ll,ll>;


int main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
    ll N;
    cin>>N;
    ll res=0,v,a;
    for(int i=1;i<=N;++i)cin>>a,res+=a;
    cin>>v;
    cout<<res-v<<endl;
}