#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;

const int N = 1000;
int a[N],cnt;

char h[17]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
int main()
{
    long long n;
    while(cin>>n)
    {
        cnt = 0;
        do{
            a[cnt++] = n%16;
            n/=16;
        }while(n!=0);
        for(int i = cnt-1;i>=0;i--)
        {
            int k = a[i];
            cout<<h[k];
        }
    }


    return 0;
}