#include<bits/stdc++.h>
using namespace std;
int main(){
    long long n;
    int a[100]={0},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]<=10){
                cout<<a[i];
            }
            else{
                cout<<char(a[i]+55);
            }
        }
    }
       
    return 0;
}
/**************************************************************
	Problem: 1289
	User: lijinkai
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/