#include<bits/stdc++.h>
using namespace std;
int main(){
	long long a[1000]={0},k=0;
	long long n;
	cin>>n;
	if(n==0){
		cout<<0;
	}
	while(n>0){
		a[k++]=n%16;
		n=n/16;
	}
	for(int i=k-1;i>=0;i--){
		if(a[i]<10){
			cout<<a[i];
		}else{
			cout<<char(a[i]+55);
		}
	}
	return 0;
}

/**************************************************************
	Problem: 1289
	User: linyuhang
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/