#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf32 1000000001
#define Inf64 4000000000000000001



int main(){
	
	string s;
	cin>>s;
	long long ans;
	if(s[0]=='x'){
		ans = stoll(s.substr(1));
		ans = (1LL<<32) - ans;
	}
	else ans = stoll(s);
	cout<<ans<<endl;
	return 0;
}