If-statement invalid syntax, but syntax is fine

if screen[v2, v1] == 1: if number > 3: screen_b[v2, v1] = 0 elif screen[v2, v1 == 0: if number < 2: screen_b[v2, v1] = 1

I keep getting an error on the "if number < 2:" line. I have stared at it for like 10 minutes and looked all over the place for a solution, but alas i have to rely on this.