#include <stdio.h>

int main(void)
{
	int N, D, i;
	long K, sum = 0;
	scanf("%d%ld", &N, &K);
	for (i = 0; i < N; ++i) {
		scanf("%d", &D);
		if (D != i + 1) ++sum;
	}
	sum /= 2;
	K -= sum;
	if (K >= 0 && K % 2 == 0) puts("YES");
	else puts("NO");
	return 0;
}