#include<bits/stdc++.h>
using namespace std;
int k,a[1000];
long long n;
int main(){
	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){  //A  65  --10
			cout<<char(a[i]+55);
		}else{
			cout<<a[i];
		}
		
	}
	return 0;
}

/**************************************************************
	Problem: 1289
	User: zengyixuan
	Language: C++
	Result: Accepted
	Time:20 ms
	Memory:2076 kb
****************************************************************/