#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define fi first
#define se second
int main(){
    string s;
    cin >> s;
    if(s[0] != 'x') cout << s << endl;
    else{
        string ans = "";
        for(int i = 1; i < s.size(); ++i) ans.push_back(s[i]);
        cout << (1ll << 32) - stoll(ans) << endl;;
    }
    return 0;
}