#include <bits/stdc++.h>

[[nodiscard]] static inline constexpr uint_fast32_t solve(const std::array<uint_fast32_t, 9>& B) noexcept
{
	return UINT32_C(55) - std::accumulate(B.begin(), B.end(), UINT32_C(0));
}

int main()
{
	std::cin.tie(nullptr);
	std::ios::sync_with_stdio(false);
	
	std::array<uint_fast32_t, 9> B = { 0, };
	for (auto& b : B) std::cin >> b;

	std::cout << solve(B) << '\n';
	return 0;
}