#include<bits/stdc++.h>
using namespace std;
int main(){
    long long n,a[10000],k=0;
    cin>>n;
    if(n==0){
        cout<<0;
    }else{
        while(n!=0){
            a[k++]=n%16;
            n=n/16;
        } 
        for(int i=k-1;i>=0;i--){
            if(a[i]>9) cout<<char(a[i]+55);
            else cout<<a[i];
        }
    }
    return 0;
}
 
/**************************************************************
	Problem: 1289
	User: linzihang
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/