#include<bits/stdc++.h>
using namespace std;
int main(){
    long long n;
    int x;
    cin>>n;
    string s;
    char c;
    while(n!=0){
        x=n%16;
        if(x<10)
        c=x+48;
        else
        c=x+55;
        n=n/16;
        s=c+s;
    }
    if(s==""){
        cout<<0;
    }
    else{
        cout<<s;
    }
}
/**************************************************************
	Problem: 1289
	User: luyanchen
	Language: C++
	Result: Accepted
	Time:12 ms
	Memory:2072 kb
****************************************************************/