#include <iostream>
#include <cstdio>
#include <cmath>
#include <vector>
#include <algorithm>
#include <utility>
#include <map>
#include <set>
#include <string>
#include <cstring>
#include <queue>
#include <cassert>
#define rf freopen("in.in", "r", stdin)
#define wf freopen("out.out", "w", stdout)
#define rep(i, s, n) for(int i=int(s); i<=int(n); ++i)
using namespace std;
const int mx = 1e5 + 10, mod = 1e9+7;

int main()
{
	//rf;// wf;
	ios::sync_with_stdio(0);

	int dressCost, sockCost, money;
	cin >> dressCost >> sockCost >> money;

	assert(1<= dressCost and dressCost <= 1e9);
	assert(1<= sockCost and sockCost <= 1e9);
	assert(dressCost <= money);

	money -= dressCost;
	int numofsocks = money/sockCost;
	
	if(money <= 0 or (numofsocks&1) == 1)
		cout << "Unlucky Chef\n";
	else
		cout << "Lucky Chef\n";

	return 0;
}