#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
int main(){
  string s;
  cin >> s;
  if(s[0]=='x'){
    string t=s.substr(1,s.size()-1);
    cout << (1LL<<32)-stoll(t) << endl;
  }
  else cout << stoll(s) << endl;
}