#include<iostream>
#include<vector>
#include<string>
using namespace std;

#define FOR(k,m,n) for(int (k)=(m);(k)<(n);(k)++)
#define rep(i,n) FOR((i),0,(n))

typedef long long ll;

const int INF=1e9+7;
const int MAX_N=2*1e5+5;
int main(){
	ll n,k;
	cin>>n>>k;
	ll ans=0;
	rep(i,n){
		int a;
		cin>>a;
		if(a!=i+1)ans++;
	}
	ans=ans/2+(ans%2);
	if(k-ans>=0 && (k-ans)%2==0)cout<<"YES"<<endl;
	else cout<<"NO"<<endl;
}