A café called Burger Kingdom opened on the central street of the city. In this kingdom burghers prepare very tasty sandwiches from useful products. You should also go to this fast food restaurant to satisfy your curiosity. Crossing the threshold of the institution, you find such a huge queue, which there is no end to the edge. Surprisingly, she moves very quickly and easily. Behind the counter is a smart saleswoman, who lets the goods to visitors. It will not be superfluous your invaluable help. Remove from the trays burghers of the same shape and color, packed three in a row. The faster you do it, the less people will crowd.