#include <iostream>
#include <string>

int main() {
    std::string s;
    std::cin >> s;
    long long value = 0;
    for (size_t i = (s[0] == 'x' ? 1 : 0); i < s.size(); i++) {
        value = 10 * value + (s[i] - '0');
    }
    if (s[0] == 'x') {
        std::cout << (1LL << 32) - value << '\n';
    } else {
        std::cout << value << '\n';
    }
}