#include<bits/stdc++.h>
using namespace std;
int main(){
	long long n,a[10000],k=0;
	cin>>n;
	if(n==0){
		cout<<0;
	}else{
		while(n!=0){
			a[k++]=n%16;
			n=n/16;
		} 
		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: zengyixuan
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/