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

unsigned long long longpow(long long a, long long b) {
    unsigned long long res = 1;
    for (int i = 0; i < b; i++) {
        res *= a;
    }
    return res;
}

int main(void) {
    ios::sync_with_stdio(false);
    cin.tie(0);
    string s;
    cin >> s;
    if (s[0] != 'x') {
        return stoi(s);
    } else {
        return longpow(2, 31) - stoi(s.substr(1, (int) s.size()));
    }
    return 0;
}