a267: 太空梭的油箱

百千.IOhttp://zerojudge.tw/ShowProblem?problemid=a267

• def every_month():
• global N, fuel, month
• fuel -= N+1
• month += 1
• N = int(fuel/5)-1 if fuel%5==0 else int(fuel/5)
• if fuel==0:
• return 'Mid2 94 Mid2'
• every_month()
• while True:
• N = int(input())
• if N == -1:
• break
• fuel = (N+1)*5
• month = 0
• every_month()
• print(month)