# Approximate the square root of a positive
# integer VERY SLOWLY by increments of 0.1
def main():
    number = int(input("Enter a positive integer: "))
    while number < 0:
        print(number, 'isn\'t a positive int')
        number = int(input("Enter a positive integer: "))
    guess = 0.1
    while guess ** 2 < number:
        guess += 0.1
    print('The square root of', number,
          'is approximately equal to ', guess)


main()