#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

#include<iostream>
#include<cstdint>
#include<cstddef>
#include<cmath>

using namespace std;
using i32 = int_fast32_t;
using i64 = int_fast64_t;
using usize = size_t;
#define rep(i, n) for (usize i = 0; i < (usize)(n); i++)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
using P = pair<i64, i64>;

int main() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);
    i64 n, z;
    cin >> n >> z;
    if (n > 2) {
        cout << "No" << endl;
        return 0;
    }else if(n == 1 && z == 1){
        cout << "No" << endl;
        return 0;
    }
    else{
        if(z == 1){
            cout << "No" << endl;
            return 0;
        }else if(n == 2 && (z % 2 == 0 || (z % 2 == 1 && z <= 3)))
        {
            cout << "No" << endl;
        }else{
            cout << "Yes" << endl;
            return 0;
        }
    }
}