#include <iostream>
#include <cstdio>

using namespace std;

int N, A[10000];
long long v;

void solve() {
    scanf("%d", &N);
    for (int i = 0; i < N; i++) scanf("%d", &A[i]);
    scanf("%lld", &v);
    long long s = 0;
    for (int i = 0; i < N; i++) s += A[i];
    printf("%lld\n", s - v);
}

int main() {
    solve();
    return 0;
}