Why isn't this working?

I'm trying to practice scripting, in this case my returning, and when I try to run the script, it says there is an error in line 16. Something about a string value. Whats wrong?

pie=65

function problem()
	print="hi"
	print="hi"
	print="hi"
	print="hi"
     return 100
end

print (pie)

pie= problem()

print (pie)


	

It's always print(text), not print=text.

pie=65

function problem()
    print("hi")
    print("hi")
    print("hi")
    print("hi")
     return 100
end

print (pie)

pie= problem()

print (pie)