#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int main() {
	char s[256];
	scanf("%s", s);

	ll y = 0;
	if (s[0] == 'x') {
		sscanf(s, "x%lld", &y);
		y = (1LL<<32)-y;
	} else {
		sscanf(s, "%lld", &y);
	}

	printf("%lld\n", y);

	return 0;
}