#include<bits/stdc++.h>
using namespace std;
int main()  
{
    long long n;
    cin>>n;
    int x;
    string s;
    char c;
    while(n!=0)
    {
        x=n%16;
        if(x>=0 && x<=9)
        {
            c=x+48;
            s=c+s;  
        }
        else
        {
            c=x+55;
            s=c+s;
        }
        n=n/16;
    }
    if(s=="")
    {
        cout<<0;
    }
    else
    {
        cout<<s;
    }
    return 0;
}
/**************************************************************
	Problem: 1289
	User: fzy001
	Language: C++
	Result: Accepted
	Time:11 ms
	Memory:2072 kb
****************************************************************/