# -*- coding: utf-8 -*-
firstTime, secondTime = [int(i) for i in input().split()]
tasks = input().split()
i = 0
second = first = 0
while i < len(tasks):
    if i % 2 == 0:
        first += int(tasks[i]) * 20
    else:
        second += int(tasks[i]) * 20
    i += 1
if firstTime + first <= secondTime + second:
    print('No chance.')
else:
    print('Dirty debug :(')