highscore = 0
while True:
    score = 0
    print("Welcome!")
    print("1.")
    print("2 + 2 = ")

    answer = int(input("Answer: "))

    if answer == 4:
        print("Correct!")
        score = score + 1
        print("Score: ", score)

    else:
        print("Incorrect!")
        print("Score: ", score)


    print("2.")
    print("5 + 5 = ")

    answer = int(input("Answer: "))

    if answer == 10:
        print("Correct!")
        score = score + 1
        print("Score: ", score)

    else:
        print("Incorrect!")
        print("Score:", score)


    print("3.")
    print("10 + 2 = ")

    answer = int(input("Answer: "))

    if answer == 12:
        print("Correct!")
        score = score + 1
        print("Score: ", score)

    else:
        print("Incorrect!")
        print("Score: ", score)


    if score >= highscore:
        highscore = score
    print("Highscore: ", highscore)