#include <bits/stdc++.h>
using namespace std;
#ifdef DEBUG_
#include "../../../onlinejudge/dump.cpp"
#else
#define dump(...)
#endif

int main(void) {
    ios::sync_with_stdio(false);
    cin.tie(0);
    string s;
    cin >> s;
    if (s[0] != 'x') {
        cout << stoi(s) << endl;
    } else {
        dump((long long) (1LL << 31));
        cout <<  (long long)(1LL << 31) - stol(s.substr(1, (int) s.size())) << endl;
    }
    return 0;
}