#include <bits/stdc++.h>
#define pb push_back
#define pii pair<int,int> 
#define sc second
#define all(s) s.begin(),s.end()
#define fr first
#define int long long
using namespace std;
const int N = 100012;
int fun(string s){
	int ans = 0;
	while (!s.empty()){
		ans *= 10;
		ans += s[0]-'0';
		s.erase(s.begin());
	}
	return ans;
}
main(){
	
	string s;
	cin>>s;
	int ans = 0;
	if (s[0] == 'x'){
		s.erase(s.begin());
		ans = 4294967296-fun(s);
	}
	else 
		ans = fun(s);
	cout <<ans;
	
}