#include<stdio.h>
char s[100005];
int main()
{
	long long int i, t = 0;
	scanf("%s", s);
	if (s[0] == 'x')
	{
		for (i = 1; s[i] != '\0'; i++)
			t = 10 * t + s[i] - '0';
		t = ((long long int) 1 << 32) - t;
	}
	else
	{
		for (i = 0; s[i] != '\0'; i++)
			t = 10 * t + s[i] - '0';
	}
	printf("%lld\n", t);
	return 0;
}