#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <queue>
#include <iomanip>
#include <cstring>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i,n) for (int i = 0; i < int(n);i++)

int main(){
  string s;
  cin >> s;
  ll ans = 0;
  if (s[0] == 'x'){
    ans = (1LL << 32) - stoll(s.substr(1,s.size()-1));
  }
  else{
    ans = stoll(s);
  }
  cout << ans << endl;

  return 0;
}