#include<stdio.h>

int main(void){
    int n,z;
    scanf("%d %d",&n,&z);
    if(n>=3){
        printf("No\n");
    }else if(z==1){
        printf("No\n");
    }else if(n==2 && z==2){
        printf("No\n");
    }else{
        printf("Yes\n");
    }
    return 0;
}