Thumb Up Thumb Down Cute Cat

#include <iostream>
using namespace std;

int main() {
    int n, s, flag = false;
    cin >> n >> s;
    for(int i = 1; i <= n; i++) {
        if((i -(n - i)) == s) {
            flag = true;
            break;
        }
    }
    if(flag)
        cout << "YES" << endl;
    else
        cout << "NO" << endl;
    return 0;
}