4 friends decided to visit the magic pond. The mystery about magic pond is that it has four stones beside it with number written on them. And fishes inside the pond have some mathematical expression written on them. 4 person can sit across the four stones. If the number of stone matches the answer of mathematical expression written on them then fish colour changes to the colour of t-shirt wore by the person sitting beside the stone and it goes to that person. Find out which fish will go to whom.