Vasya-Clerk.py

def tickets(people):
 money=0
 M50=0
 for i in people:
  if i==25:
    money+=1
  elif i==50:
    money-=1
    m50+=1
  elif i==100 and M50>0:
    money-=1
    M50-=1
  else:
   money-=3
  if money<0 or M50<0:
   return 'NO'
 return 'YES'


'''
The new "Avengers" movie has just been released! There are a lot of people at the cinema box office standing
in a huge line. Each of them has a single 100, 50 or 25 dollar bill. An "Avengers" ticket costs 25 dollars.

Vasya is currently working as a clerk. He wants to sell a ticket to every single person in this line.

Can Vasya sell a ticket to every person and give change if he initially 
has no money and sells the tickets strictly in the order people queue?

Return YES, if Vasya can sell a ticket to every person and give 
change with the bills he has at hand at that moment. Otherwise return NO.

Examples:
tickets([25, 25, 50]) # => YES 
tickets([25, 100]) # => NO. Vasya will not have enough money to give change to 100 dollars
tickets([25, 25, 50, 50, 100]) # => NO. Vasya will not have the right 
bills to give 75 dollars of change (you can't make two bills of 25 from one of 50)

'''