n, k = map(int, raw_input().split())
d = map(int, raw_input().split())

x = 0
for i in xrange(n):
    if d[i] != i+1:
        x += 1

x = (x+1)/2
if x % 2 == k % 2 and x <= k:
    print "YES"
else:
    print "NO"