#include <stdio.h>

int main(void)
{
	int num,index;
	char s[9];
	scanf("%d",&num);
	// s'      25'
	//   012345678
	//   000000000
	index = 8;
	s[index] = 0;
	index = 7;
	if (num == 0) {
		s[index] = '0';
		index--;
	}
	else {
		while (num > 0) {
			int digit = num & 0xf;
			if (digit < 10)
				s[index] = digit + '0';
			else
				s[index] = (digit - 10) + 'A';
			num = num >> 4;
			index--;
		}
	}
	printf("%s\n", &s[index+1]);
	return 0;
}