Chef and Negative Arrays

Chef came from the City-network and got sick. Doctor advised him to rest for two weeks. But Chef was bored out of his mind. He saw an array puzzle beside him and decided to play it. There are $N$ arrays of same size. Let the size of each array be $K$. Each element of every array is a positive integer. The solve the puzzle Chef has to select at most $P$ arrays from the given $N$ arrays and perform