#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;
}

#include<bits/stdc++.h>
using namespace std;
long long n,a[100000000],i;
int main(){
	cin >> n;
	if(n==0) {
		cout << "0";
		return 0;
	}
	while (n){
		a[++i]=n%16;
		n/=16;
	}
	for(int j=i; j>=1; j--){
		if(a[j]<10) cout << a[j];
		else cout << char(a[j]-10+'A');
		}
        
	return 0;
}