#include <bits/stdc++.h>
typedef  long long ll;
#define INF 1000000000
using namespace std;
#define MOD 1000000007
ll mergecount(vector<int> &a) {
  ll count = 0;
  int n = a.size();
  if (n > 1) {
    vector<int> b(a.begin(), a.begin() + n/2);
    vector<int> c(a.begin() + n/2, a.end());
    count += mergecount(b);
    count += mergecount(c);
    for (int i = 0, j = 0, k = 0; i < n; ++i)
      if (k == c.size())       a[i] = b[j++];
      else if (j == b.size())  a[i] = c[k++];
      else if (b[j] <= c[k])   a[i] = b[j++];
      else                   { a[i] = c[k++]; count += n/2 - j; }
  }
  return count;
}
int main(void){
    int n;
    ll k;
    cin>>n>>k;
    vector<int>v(n);
    for(int i=0;i<n;i++){
        cin>>v[i];
    }
    ll sum=mergecount(v);
    if((k-sum)%2==0 and k>=sum){
        cout<<"YES"<<endl;
    }else{
        cout<<"NO"<<endl;
    }

}