下面程序的作用是显示输入的三个整数的最大值和最小值,请补充完整。
def f(a, b, c):

    ______________________

    if (b > max): max = b
if (c > max): max = c
if (b < min): min = b
if (c < min): min = c
    ______________________

x, y, z = input("Please input three whole numbers: ").split()
x=int(x);y=int(y);z=int(z)
max, min = f(x, y, z)
print("Max value: ", max, "Min value: ", min)