#include<bits/stdc++.h>
using namespace std;
int main(){ 
    int n,a[10000],k=0;
    cin>>n;
    while(n!=0){
    	a[k++]=n%16;
    	n=n/16;
    }
  for(int i=k-1;i>=n;i--){
  	if(a[i]>9) cout<<char(a[i]+55);
  	else cout<<a[i];
  }
    return 0;
}
/**************************************************************
	Problem: 1289
	User: hang
	Language: C++
	Result: Wrong Answer
****************************************************************/