HMMT 1999 T1

A combination lock has a 3 number combination, with each number an integer between 0 and 39 inclusive. Call the numbers $n_{1}, n_{2}$, and $n_{3}$. If you know that $n_{1}$ and $n_{3}$ leave the same remainder when divided by 4 , and $n_{2}$ and $n_{1}+2$ leave the same remainder when divided by 4 , how many possible combinations are there?