Read the text and answer the following question!

    Long time ago time there was a smart mouse deer. He lived near a river. The mouse deer used to go to the river to drink.

    One day, the mouse deer was thirsty. He wanted to drink in the river but he knew that crocodiles were staying and waiting underwater to eat him. He thought hard and got bright idea. He said out loudly, "I will put in my leg and find out whether the water is warm or nor." Of course the mouse deer did not do what he said. He did not put his leg but the mouse deer took a wood stick and put one end into the water. Blurr...! Surely a crocodile grabbed the wood stick and pulled it underwater. Seeing that, the mouse deer laughed and said, "Stupid crocodile! Can't you see the difference between a wood stick and a leg? Then the mouse deer ran to another side of the river and drink some water.

    On the following day, the mouse deer was hungry. He wanted to eat some grass on the side of the river so he had to go cross the dangerous river which was full of crocodiles. Again he thought hard and found another smart idea and said loudly, "Crocodiles come up." Then some crocodiles rose from the water. They looked happy and showed their sharp teeth and said "Hello, Mouse Deer. Do you come to be my lunch? We are hungry." The mouse deer just smiled and replied. "Sorry, Crocodiles, not today, I come to you to bring an invitation from the king. You are invited to the party. The king ordered me to count all crocodiles in this river so he knew how to prepare enough meal for you." All the crocodiles felt happy and said, "Really...? Tell us what to do!" said a crocodile. "You have to line up from this side of the river the other side," said the mouse deer. Not long after that the crocodile got all his friends and family. He ordered to line up across the river.

    The mouse deer then jumped on the Crocodile's back. "One," the mouse deer counted. He jumped onto the next crocodile, "Two." And he jumped again on the next crocodile, "Three." He kept jumping until he arrived on the other side of the river. "Just enough," said the mouse deer. "I have counted all of you." He laughed and ran to the field of grass.

What is the purpose of the text?