"RAISE"-ing a question.

Cheers, fellow Treehousers.

In the video course on Raising Exceptions, in the Python Basics section of Python, I didn't quite fully grasp the exercise provided to us by Professor Craig Dennis.

The code runs perfectly for a division with negative numbers and division by 0. But let's imagine, "the user" when prompted with one of the two questions, decides to write a string. For example: My program - "How many people had dinner? " User - "5 but only 4 of us are paying."

They are displayed with the following, in my code: "We'll play later. Try again, please.
(In other words, invalid literal for int() with base 10: '5 but only 4 of us are paying.')."

Here goes an example of my program, in the text editor:

import math 

def split_check(total, num_of_people):
    if num_of_people <=1:
        raise ValueError("more than 1 person is required to split the check.")
    return math.ceil(total/ num_of_people)

try:
    total = float(input("What was the total of the dinner?  "))
    num_of_people = int(input("How many people had dinner?  "))
    amount_due = split_check(total, num_of_people)
except ValueError as err:
    print("We'll play later. Try again, please.")
    print("(In other words, {}).".format(err))
else:
    print("Each person owes ${}.".format(amount_due))

How can I fix this?

Thanks, Have a Great day.

[MOD - added ```python formatting -cf]