#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,m,n) for(int i=m; i<n; ++i)
#define repl(i,m,n) for(ll i=m; i<n; ++i)

int main(){
    string S;
    cin >> S;
    if(S[0] != 'x'){
        cout << S << endl;
    }else{
        int n = S.size();
        ll T = stoll(S.substr(1,n-1));
        cout << ll(1LL << 32) - T << endl; 
    }
    return 0;
}