.strangers.

where x=your circle,

You. (x=1)

You met a stranger. You became friends. (x=1+1=2)

You met n strangers over time t. You circle grows. (x=2+n*t)

Your rate of meeting strangers decreased by half as you start to think differently than others. In the same time, m friends became strangers over time t. (x=2+[(n/2)*t]-(m*t))

You made sure now that the current number remain constant and you would introduce a new variable p to increase your circle over time t, hence (x=(p*t)+X), where X is that constant.

Suddenly, something went wrong and (x=(p*t)+(X-1))

Vengeance. 

Aku tak lupa. Serius.