A SMALL PROBLEM

I came across this problem which I am stating below.

If,

2803 = 3;

7265 = 1;

3680 = 4;

1679 = 2 and

1457 = 0

then what is

2900 = ? and

8888 = ?

Try solving it.

"Charlotte Church - What Child Is This - Greensleeves", 2000