Rotation PP Question

I am currently working on a scene where I have particle instances falling like paper.

I used a random runtime expression for rotation: particleShape1.RotPP += 1; and a creation expression particleShape1.RotPP = rand(0,360);

At the end of the animation the falling paper forms a heart using a heart shaped Goal.

I need all the papers to end up with the same rotation when they I turn on my Goal.

Is there an expression that will make all the instanced geo be rotated in the same angle?