long k;c,n,d[1<<18],u[1<<18];
int dfs(int v)
{
u[v]?k-=c-1:(u[v]=1,c++,dfs(d[v]));
}
main(i)
{
	for(scanf("%d%ld",&n,&k);~scanf("%d",d+i++););
	for(i=0;i++<n;)!u[i]&&(c=0,dfs(i));
	return!puts(k<0||k%2?"NO":"YES");
}