output_description: If Takahashi will win, print `Yes`; if he will lose, print `No`.
  
  * * *
input_description: Input is given from Standard Input in the following format:
  
      
      
      A B C D
attempt: h1, a1, h2, a2 = map(int, input().split())
  cnt1 = h2 // a1 if h2 % a1 == 0 else h2 // a1 + 1
  cnt2 = h1 // a2 if h1 % a2 == 0 else h1 // a2 + 1
  print("Yes" if cnt1 <= cnt2 else "No")
  
problem_description: Statement
  
  Takahashi and Aoki will have a battle using their monsters.
  
  The health and strength of Takahashi's monster are A and B, respectively, and
  those of Aoki's monster are C and D, respectively.
  
  The two monsters will take turns attacking, in the order Takahashi's, Aoki's,
  Takahashi's, Aoki's, ... Here, an attack decreases the opponent's health by
  the value equal to the attacker's strength. The monsters keep attacking until
  the health of one monster becomes 0 or below. The person with the monster
  whose health becomes 0 or below loses, and the other person wins.
  
  If Takahashi will win, print `Yes`; if he will lose, print `No`.
samples: [{"input": "10 9 10 10", "output": "No\n    \n\nFirst, Takahashi's monster attacks Aoki's monster, whose health is now 10-9=1.\n\nNext, Aoki's monster attacks Takahashi's monster, whose health is now 10-10=0.\n\nTakahashi's monster is the first to have 0 or less health, so Takahashi loses.\n\n* * *"}, {"input": "46 4 40 5", "output": "Yes"}]