# The first Python program
#functions go here

def yes_no(question):


    while True:

        response = input(question).lower()

        # check the user says yes / no
        if response == "yes" or response == "y":
            return "yes"
        elif response == "no" or response == "n":
            return "no"
        else:
            print("Please enter yes / no")

#display instructions
def instructions():

    print('''
    
*** Instructions ****

To begin, choose the number of rounds (or press
infinite mode).

Then play against the computer. You need to pick R (rock),
P (paper) or S (scissors).

The rules are as follows:
- Paper beats Rock
- Rock beats scissors
- Scissors beats paper

Good Luck!
    ''')

def int_check():


    error = 'Please enter an integer more than / equal to 13.'

    while True:
        try:
            response = int(input("What is the game goal? (13 or above) "))

            if response < 13:
                print(error)
            else:
                return response

        except ValueError:
            print(error)

#main routine
print()
print("Rock / Paper / Scissors Game")
print()

# ask the user if they want to see the instructions and display
#them if requested
want_instructions = yes_no("Do you want to see the instructions? ")

#checks users enter yes (y) or no (n)
if want_instructions == "yes":
    instructions()

print()
game_goal = int_check()
print(game_goal)