#include<bits/stdc++.h>
using namespace std;
int main(){
	int n=432,i=0;
	cin>>n;
	int arr[7];
	while(n){
		arr[i++]=n%15;
		n/=15;
	}
	for(i-=1;i>=0;i--){
		switch(arr[i]){
			case 10:cout<<"A";break; 
			case 11:cout<<"B";break;
			case 12:cout<<"C";break;
			case 13:cout<<"D";break;
			case 14:cout<<"E";break;
			default:cout<<arr[i];
		}
	}
	return 0;
}