#include<bits/stdc++.h>
using namespace std;
#include<atcoder/all>
using namespace atcoder;
using ll = long long;
string s;

void solve(){
	ll x = 0;
	if(s[0]=='x'){
		for(int i = 1;i<s.size();i++){
			x*=10;
			x += s[i]-'0';
		}
		x =( 1ll<<(32)) - x;
	}
	else{
		for(int i = 0;i<s.size();i++){
			x*=10;
			x+=s[i]-'0';
		}
	}
	cout<<x<<endl;
}

signed main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	cin >> s;
	solve();
}