#include <cstdio> #include <cstdlib> #include <cstring> #include <cmath> #include <climits> #include <iostream> #include <vector> #include <string> #include <sstream> #include <algorithm> #include <utility> #include <set> #include <map> #include <stack> #include <queue> #include <deque> #include <functional> using namespace std; typedef long long ll; typedef vector<int> vi; typedef pair<int, int> pii; typedef vector<pii> vpii; #define fst first #define scd second #define PB push_back #define MP make_pair #define rep(i,x) for(int i=0;i<(x);++i) #define rep1(i,x) for(int i=1;i<=(x);++i) #define rrep(i,x) for(int i=(x)-1;i>=0;--i) #define rrep1(i,x) for(int i=(x);i>=1;--i) #define FOR(i,a,x) for(int i=(a);i<(x);++i) #define all(a) a.begin(),a.end() #define rall(a) a.rbegin(),a.rend() #define omajinai ios::sync_with_stdio(false);cin.tie(0) template<typename T>bool chmax(T&a,T b){if(a<b){a=b;return true;}return false;} template<typename T>bool chmin(T&a,T b){if(a>b){a=b;return true;}return false;} template<typename T>T get(){T a;cin>>a;return a;} template<typename T>T rev(T a){reverse(all(a));return a;} template<typename T>istream&operator>>(istream&is,vector<T>&vec){rep(i,vec.size())is>>vec[i];return is;} template<typename T>vector<T>&sort(vector<T>&a){sort(all(a));return a;} const int inf = 1e9; const ll linf = 3e18; const double eps = 1e-9; signed main() { int N; cin >> N; int sum = 0; rep(i, N) sum += get<int>(); int v; cin >> v; cout << sum - v << endl; }