#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	if(n==0)
	{
		cout<<0;
		return 0;
	} 
	string s;
	while(n)
	{
		int t=n%16;
		if(t<=9) s=s+char('0'+t);
		else s=s+char('A'+t-10);
		n/=16;
	}
	reverse(s.begin(),s.end());
	cout<<s;
	return 0;
}