#include<bits/stdc++.h>
using namespace std;
int main()
{
	long long n;
	cin>>n;
	int a[100],k=1;
	if(n==0){
		cout<<0;
		return 0;
	}
	while(n>0){
		a[k++]=n%16;
		n=n/16;
	}
	for(int i=k-1;i>=1;i--){
		if(a[i]>=10) cout<<char('A'+a[i]-10);
		else cout<<a[i];
	}
}

/**************************************************************
	Problem: 1289
	User: zhuangsongyu
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2072 kb
****************************************************************/