#include<stdio.h>
int main()
{
   int a,b,c,d,t,m;
   scanf("%d %d %d %d",&a,&b,&c,&d);
   while(1){
   a = a-b;
   if(b <= 0){
     printf("Yes\n");
     break;
   }
   a = a-b;
   if (a <= 0)
   printf("No\n");
   break;
   }
   }
