#include<bits/stdc++.h>
using namespace std; 
char nl = '\n';
using i64 = long long;

void solve(int t) {
    // cout << "test #" << t << nl;
    int n, k; cin >> n >> k;
    vector<pair<int, int>> A(n);
    for (int i = 0; i < n; i++) {
        cin >> A[i].first;
        A[i].second = i;
    } 
    sort(A.begin(), A.end());
    int mx = -1, mn = n;
    for (int i = 0; i < n; i++) {
        if (A[i].second != i) {
            mx = max(mx, i);
            mn = min(mn, i);
        }
    }
    cout << (mx - mn + 1 <= k ? "YES" : "NO") << nl;
} 

int main() {
    int tt = 1;
    // cin >> tt;
    for(int t = 1; t <= tt; t++) solve(t);
}