totalNumber=0
whileExit=0
print("Hello")

numberInput=int(input("Enter number (-1 to exit): "))
totalNumber=totalNumber+numberInput
#print(numberInput)

while whileExit==0:
       
    numberInput=int(input("Enter number (-1 to exit): "))

    if numberInput==-1:
        numberInput=0
        whileExit=1
        
    if numberInput<-1:
        print("you cannot enter a negative number")
        numberInput=0
        

    totalNumber=totalNumber+numberInput
    #print(numberInput)

print("Your total is {0}".format(totalNumber))
print("Goodbye")