#include<stdio.h>
#include<stdint.h>
int main()
{
	char s[11];
	uint64_t i, t = 0;
	scanf("%s", s);
	if (s[0] == 'x'){
		for (i=1;s[i]!='\0';i++)t=10*t+s[i]-'0';
		t=((uint64_t)1<< 32)-t;
	}else{
		for(i=0;s[i]!='\0';i++)t=10*t+s[i]-'0';
	}
	printf("%llu\n",t);
	return 0;
}