#include <bits/stdc++.h>

using i64 = long long;

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    
    std::string s;
    std::cin >> s;
    
    if (s[0] == 'x') {
        s[0] = '-';
    }
    
    unsigned ans = std::stoi(s);
    std::cout << ans << "\n";
    
    return 0;
}