#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
using vll = vector<long long>;
using vvll = vector<vector<long long>>;
using vs = vector<string>;
using vb = vector<bool>;
using vvb = vector<vector<bool>>;
#define lln \
  ll n;     \
  cin >> n;
#define REP(i, n) for (long long i = 0; i < n; i++)
#define REPIN(v, n) \
  for (long long i = 0; i < n; i++) cin >> v[i];
ll gcd(ll x, ll y) { return (x % y) ? gcd(y, x % y) : y; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }

ll cnt(ll i, string s) {
  ll ret = 0;
  for (; i < s.size(); i++) {
    ret *= 10;
    ret += (s[i] - '0');
  }
  return ret;
}

int main() {
  string s;
  cin >> s;
  ll t = 0;
  ll x = 4294967296;
  if (s[0] == 'x') {
    t = x - cnt(1, s);
  } else {
    t = cnt(0, s);
  }
  cout << t << endl;
}