num1 = int(input("Enter 1 number: "))
num2 = int(input("Enter 2 number: "))
num3 = int(input("Enter 3 number: "))
sel = int(input("Summ(1) and proiz(2): "))
summ = ( num1 + num2 + num3 )
proz = ( num1 * num2 * num3 )

if sel == 1:
    print(summ)
elif sel == 2:
    print(proz)
else:
    print("please enter 1 and 2")