#include <bits/stdc++.h>

[[nodiscard]] static inline constexpr int_fast32_t solve(const int_fast32_t N, const std::vector<int_least32_t>& A, const int_fast32_t v) noexcept
{
	return std::accumulate(A.begin(), A.end(), INT32_C(0)) - v;
}

int main()
{
	std::cin.tie(nullptr);
	std::ios::sync_with_stdio(false);
	
	int_fast32_t N, v;
	std::cin >> N;
	std::vector<int_least32_t> A(N);
	for (auto& a : A) std::cin >> a;
	std::cin >> v;

	std::cout << solve(N, A, v) << '\n';
	return 0;
}