def main():
    binaryInput =input("Enter a binary number ==> ")
    exponentValue =len(binaryInput)
    totalValue = 0
    
    # ^ This is the starting command when we start our line of code, when we press start it will say,"Enter a
    # binary number ==> ".
    
    if exponentValue < 1:
        del binaryInput
        del exponentValue
        del totalValue
        print("All you did was press enter,I need a value to run")
        main()
        
        # ^ get rid of the binaryinput, exponentvalue, and total value. Then we print out "all you did was press enter,
        #I need a value to run" Once we press enter without putting any number
        
    for conversion in range(exponentValue):
        print(binaryInput[conversion])
        if binaryInput[conversion] == "0":
            actualValue = 0
        elif binaryInput[conversion] == "1":
            actualValue = 2
        else: 
            print("0 or 1 please")
            del binaryInput
            del exponentValue
            del totalValue
            main()
        
        # ^ You can only type 0 or 1 for the code to work, if you type in any other thing other then 0 and 1 it will show
        #"0 or 1 please" it will also delete the binaryInput, exponentValue, and totalValue . 
        #So for anyone using it, they will have to type 0 or 1 for the code to work
        
        trueValue = actualValue **(exponentValue -1)
        
    if actualValue == 0 and exponentValue == 1:
            trueValue = 0
            
            exponentValue -= 1
    
    totalValue += trueValue
    print("The decimal value of {} is {}".format(binaryInput,totalValue))
    quit()
    
    # ^ This is the final thing once you typed in your values, it will pop up with a text saying, "The decimal value of (Value)
    # is (Value)". then after it gives you your final result it will end
    
        
main()