#include <iostream>
#include <cstdint>

using namespace std;

static inline uint32_t solve(const string& S)
{
	if (S[0] != 'x')
		return stoul(S);
	else
		return -stoul(S.substr(1));
}

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);

	string S;
	S.reserve(11);
	cin >> S;

	cout << solve(S) << '\n';
	return 0;
}