#include<bits/stdc++.h>
using namespace std;

int main() {
	string S;
	cin >> S;

	long long ans = 0;
	int sz = S.size();
	if( S[0] == 'x' ) {
		long long t = 0;
		for( int i = 1; i < sz; i++ ) t = t * 10 + S[i] - '0';
		ans = (1LL << 32) - t;
	}
	else {
		for( int i = 0; i < sz; i++ ) ans = ans * 10 + S[i] - '0';
	}

	cout << ans << endl;
}