GUI Bullet bar help

i have the GUI bullet bar script but how can i make them go down each 5 Bullets?
it looks like this:
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but i want it like this:

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how can i make this?

    for (var i : int = 1; i <= BulletsLeft; i++){
    GUI.DrawTexture(Rect(10 + ((i - 1) * (BulletTexture.width + 2)), 10, BulletTexture.width, BulletTexture.height), BulletTexture);
    }

for (var i : int = 0; i < BulletsLeft; i++){
GUI.DrawTexture(
Rect(
10 + ( i * (BulletTexture.width + 2)),
10 + ( i/10 * (BulletTexture.height + 2)),
BulletTexture.width,
BulletTexture.height
), BulletTexture
);
}

Second parameter for the Rect is for the y position, just offset the position every n bullet, in example, n = 10, so you will get 10 bullets per row.