#oliver short
#15/09/14
#exercise: variable improvement revision exercises



number1 = int(input("what is your first number"))
number2 = int(input("what is your second number"))
number3 = int(input("what is your third number"))
number4 = int(input("whatis your forth number"))

answer = number1 + number2 + number3 + number4

print (answer)
