1. The robotics club accepts only those who know mathematics, physics, or programming. It is known that 8 members of the club know physics, 7 know mathematics, and 11 know programming. Additionally, it is known that at least two know both physics and mathematics, at least three know both mathematics and programming, and at least four know both physics and programming. What is the maximum number of club members possible under these conditions?
Answer 19.

2. From the sequence of natural numbers $1,2,3, \ldots$, all perfect squares (squares of integers) have been removed. What number will be in the 2018th position among the remaining numbers?

Answer: 2063.