#include<bits/stdc++.h> using namespace std; using Int=long long; using Real=long double; template<class T,class S>inline bool chmin(T&A,S B){if(A>B){A=B;return true;}else{return false;}} template<class T,class S>inline bool chmax(T&A,S B){if(A<B){A=B;return true;}else{return false;}} #define REP(i,n)for(int i=0;i<(n);++i) #define REP1(i,n)for(int i=1;i<=(n);++i) #define ALL(x)begin(x),end(x) #define drop(x){cout<<(x)<<'\n';return;} int N,A,S,V; void sol() { cin>>N; REP(i,N) { cin>>A; S+=A; } cin>>V; cout<<S-V<<"\n"; } int main() { ios::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); cout<<fixed<<setprecision(16); int TE=1; //cin>>TE; while(TE--)sol(); }