#include <iostream>
#include <stack>
using namespace std;
int main()
{
	int num;
	cin >> num;
	if(num == 0){
		cout << 0;
			return 0;
	}
	stack<char> s;
	while (num)
	{
		int temp = num % 16;
		if (temp < 10)
		{
			s.push(temp + '0');
		}
		else
		{
			s.push(temp - 10 + 'A');
		}
		num /= 16;
	}
	while (!s.empty())
	{
		cout << s.top();
		s.pop();
	}
	return 0;
}