Dear native English please tell me how to write?

I translating my website and I don't know how to write
"ACTION 1 + 1 = 3" or ACTION 3 dress stock at a price of 2 or 3 dresses for the price of 2
акция 1+1=3
Thank you.

Quote:

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Originally Posted by Natasha Russia

I translating my website and I don't know how to write
"ACTION 1 + 1 = 3" or ACTION 3 dress stock at a price of 2 or 3 dresses for the price of 2
акция 1+1=3
Thank you.

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Buy 2, get one free? It's a commonly used 'discount' in an attempt to encourage a sale.