// #define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
int main() {
    // Input
    string T;
    cin >> T;

    // Output
    if (T[0] == 'x') cout << (1LL << 32) - stoll(T.substr(1)) << endl;
    else cout << T << endl;
}