def ave(num1,num2):
        return (num1+num2)/2.0

def f(x):
    x = x - 1
    return x


x = 4
y = 7
z = ave(x,y)
print ("The average of",x,"and",y,"is", format(z,".1f"))

print("F(x) is", f(x))
print("x is",x)