#include<bits/stdc++.h>
using namespace std;
int main(){
	long long  n,k=0,a[10000];
	cin>>n;
	if(n==0){
		cout<<0;
	}
	while(n!=0){
		a[k]=n%16;
		n=n/16;
		k++;
	}for(int i=k-1;i>=0;i--){
		if(a[i]>9){
			cout<<char(a[i]+55);
		}else{
				cout<<a[i];
		}
	
	}

	return 0;
}

/**************************************************************
	Problem: 1289
	User: jiangyuanfeng
	Language: C++
	Result: Accepted
	Time:13 ms
	Memory:2072 kb
****************************************************************/