#include <bits/stdc++.h>

using namespace std;
void fast_io() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}

int main() {
    fast_io();
    string s;
    cin >> s;
    if (s[0] != 'x') {
        cout << s << endl;
        return 0;
    }
    long long t = stoll(s.substr(1));
    cout << (1LL << 32) - t << endl;
}