#include <bits/stdc++.h>
using namespace std;
 
#define fi first
#define se second
#define pb push_back
using vi = vector <int>;
using ll = long long;
using vl = vector <ll>;
using pii = pair <int, int>;
const ll mod = 998244353;
//~ const ll mod = 1e9 + 7;
ll qpow(ll a, ll b, ll m = mod) { ll r = 1, t = a;
	for(; b; b /= 2) { if(b & 1) r = r * t % m; t = t * t % m; } return r; }

int main() {
	ios::sync_with_stdio(0);
	
	string s; cin >> s;
	
	ll ans = 0;
	if(s[0] == 'x')
		ans = (1LL << 32) - stol(s.substr(1));
	else
		ans = stol(s);
	
	cout << ans << '\n';
}