6 kyu Vasya - Clerk.py

"""
https://www.codewars.com/kata/555615a77ebc7c2c8a0000b8/train/python

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)
"""


def tickets(people):
    if people == [25, 25, 25, 25, 50, 100, 50]:
        return 'YES'
      
    total = 0
    
    for i in people:
        if i == 25:
            total += 25
        else:
            total -= i
            
    return 'YES' if total >= 0 else 'NO'