Pick a lottery number

Number Theory Level pending

We had four cards numbered $$1$$,$$2$$,$$3$$ and $$4$$ respectively. Three of the four cards are placed into the boxes as shown in the equation below.

$$n$$=$$5$$+$$\boxed{}$$+$$\boxed{}$$-$$\boxed{}$$

Find the sum of the numbers possible for obtaining $$n$$.

Source from PMWC.

×