문제
풀이
#include <iostream>
using namespace std;
bool solve(void) {
int n, k; cin >> n >> k;
return k % 2 == 0 || n >= k + 1;
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout << (solve() ? "YES" : "NO");
return 0;
}