count=0

print("Hello")
number=int(input("Please input a number. If you wish to quit please enter -1 "))

while(number!=-1):
    final=count+number
    count=final
    number=int(input("Please input a number. If you wish to quit please enter -1 "))

else:
    print("your total is {0}".format(final))
    print("Goodbye")