#include <iostream>
using namespace std;

int main() {
    int n, k;
    while (cin >> n >> k) {
        int sum = 0;
        for (int i = 1; i < n; i++) {
            for (int j = 1; j < n; j++) {
                if (i + j == n){
                    sum++;
                    break;
                }
                    
            }
        }

        if (sum >= k)
            cout << "YES" << endl;
        else
            cout << "NO" << endl;
    }

}
// 64 位输出请用 printf("%lld")