number1 = int(input('Enter a number:\t'))
number2 = int(input('Enter a number:\t'))
number3 = int(input('Enter a number:\t'))

def largest(num1, num2, num3):
    if (num1 > num2) and (num1 > num3):
      largest_num = num1
    elif (num2 > num1) and (num2 > num3):
       largest_num = num2
    else: 
       largest_num = num3

    print("the largest number is:" , largest_num)

largest(number1, number2, number3)