#include<bits/stdc++.h>
using namespace std;
char a[9999];
char ss(int n){
	if(n<10){
		return char(n+'0');
	}else{
		return char(n-10+'A');
	}
}
int main(){
    int n,s=0;
    cin>>n;
    while(n!=0){
        a[s++]=ss(n%16);
        n/=16;
    }
    for(int i=s-1;i>=0;i--){
        cout<<a[i];
    }
    return 0;
}
/**************************************************************
	Problem: 1289
	User: zzz
	Language: C++
	Result: Wrong Answer
****************************************************************/