#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<ll, ll>;
#define drep(i, cc, n) for (ll i = (cc); i <= (n); ++i)
#define rep(i, n) drep(i, 0, n - 1)
#define all(a) (a).begin(), (a).end()
#define pb push_back
#define fi first
#define se second

const ll MOD = 1000000007;
const ll MOD2 = 998244353;
const ll INF = 1LL << 60;
const ll MAX_N = 2e5;

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    
    string s; cin >> s;

    ll t = 0;
    if(s[0]=='x'){
        for(ll i=1; i<(ll)s.size(); i++) t = 10*t + (s[i]-'0');
        t = (1LL<<32)-t;
    }else{
        rep(i, (ll)s.size()) t = 10*t + (s[i]-'0');
    }

    cout << t << endl;
}