total = 0
currentNumber = 0

print("Hello")

while(currentNumber != -1):
    currentNumber = int(input("Enter Number: "))
    if(currentNumber >= -1):
        if(currentNumber != -1):
            total = total + currentNumber
    else:
        print("Cannot use that number")
        
print("Your Total is {0}".format(total))
print("Goodbye")