count=0

print("Hello\n")
num=int(input("Please enter a number (enter -1 to exit): "))
stop=-1

while (num != stop):
    print("{0}".format(num))
    num=int(input("Please enter a number (enter -1 to exit): "))
    if (num == stop):
        print("your total is {0}".format(num+num))
        print("Goodbye")