package main

import (
	"fmt"
	"sort"
)

func main() {
	var N, K int
	fmt.Scan(&N, &K)
	D := make([]int, N)
	d := make([]int, N)
	for i := 0; i < N; i++ {
		fmt.Scan(&D[i])
		d[i] = D[i]
	}
	sort.Ints(d)
	var cnt int
	for i := 0; i < N; i++ {
		if D[i] != d[i] {
			cnt++
		}
	}
	cnt /= 2
	// fmt.Println(cnt, K)
	// fmt.Println(cnt%2, K%2)
	if cnt%2 == K%2 {
		fmt.Println("YES")
	} else {
		fmt.Println("NO")
	}
}