#!/usr/bin/env python3


def judge(n, k, ds):
    num_diffs = sum(i != j for i, j in zip(range(1, n + 1), ds))
    return (num_diffs // 2) % k == 0


def main():
    n, k = (int(x) for x in input().split())
    ds = (int(x) for x in input().split())
    print("YES" if judge(n, k, ds) else "NO")


if __name__ == '__main__':
    main()