#include <iostream>#include <cstdio>#include <cstring>#include <set>#include <cmath>#include <map>#include <queue>using namespace std ;int main(){    int k,p ;    while(~scanf("%d%d",&k,&p))    {        if(p==2)        {            puts("NO") ;            continue ;        }        int temp=k/(p-1) ;        if(temp&1)puts("YES") ;        else puts("NO") ;    }    return 0 ;}