# How to compute a portfolio value?

I am learning fundamentals of option market and ran into an example I do not understand :

Let's assume I have a portfolio of 3 shares priced \$22, and a European call option to buy a share for \$21 in 3 months. If the stock price turns out to be \$22, the value of the option will be \$1. The text states that the value of my portfolio is $$22*3-1 = \65$$, why isn't is $$22*3+1=\67$$ ? Thanks

If you are long the call option (you purchased it), the value will be as you said $$22*3+1=67$$.
If you are short the call option (you sold it), the value becomes: $$22*3-1=65$$