How many teenagers to beat a great white shark with minimal injuries

The teenagers are 15-16, all male, range in height from 5’5 to 6’2, and range in weight from 55kg to 85kg. Battle takes place on a beach (in the water). No weapons.

R1: the teenagers are approached by a shark out of the blue

R2 teenagers are actively looking for and find a shark to fight.

This is not a troll post.