#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,n) for(int i=0;i<int(n);i++)

int main(){
  string s;
  cin>>s;
  ll nw;
  if(s.at(0)=='x'){
    string b=s.substr(1);
    nw=(1LL<<32)-stoll(b);
  }else{
    nw=stoll(s);
  }
  cout<<nw<<endl;
}