import random

STARTING_CHIPS = 21

def setup():
    player1_name = input("Enter Player 1's name: ")
    player2_name = input("Enter Player 2's name: ")
    rounds = int(input("Enter the number of rounds: "))
    return player1_name, player2_name, rounds

def maintenance():
    chips = STARTING_CHIPS
    p1_score = 0
    p2_score = 0
    currently_playing = random.choice(["Player 1", "Player 2"])
    return chips, p1_score, p2_score, currently_playing

def game_loop(player1_name, player2_name, rounds):
    chips, p1_score, p2_score, currently_playing = maintenance()
    
    for round_number in range(1, rounds + 1):
        print(f"\nRound {round_number}")
        
        while chips > 0:
            print(f"\nChips left: {chips}")
            print(f"It's {currently_playing}'s turn.")
            try:
                chips_taken = int(input("How many chips do you want to take? (1-3): "))
                if chips_taken < 1 or chips_taken > 3:
                    print("That's not a valid number of chips! Please choose 1, 2, or 3.")
                    continue
                chips -= chips_taken
                if chips <= 0:
                    if currently_playing == "Player 1":
                        p1_score += 1
                        print(f"{player1_name} wins this round!")
                    else:
                        p2_score += 1
                        print(f"{player2_name} wins this round!")
                    break
                else:
                    currently_playing = "Player 2" if currently_playing == "Player 1" else "Player 1"
            except ValueError:
                print("That's not a valid input! Please enter a number.")
    
    return p1_score, p2_score

def final_winner(player1_score, player2_score, player1_name, player2_name):
    if player1_score > player2_score:
        print(f"\n{player1_name} wins the game with a score of {player1_score}!")
    elif player2_score > player1_score:
        print(f"\n{player2_name} wins the game with a score of {player2_score}!")
    else:
        print("\nIt's a tie!")

def main():
    print("Welcome to the 21 Chips Game!")
    player1_name, player2_name, rounds = setup()
    player1_score, player2_score = game_loop(player1_name, player2_name, rounds)
    final_winner(player1_score, player2_score, player1_name, player2_name)

if __name__ == "__main__":
    main()