A, B, C, D = list(map(int, input().split()))



T_time = C // B

if not C % B == 0 :

  T_time += 1



A_time = A // D

if not A % D == 0 :

  A_time += 1



if T_time <= A_time :

  print("Yes")

else :

  print("No")
A, B, C, D = list(map(int, input().split()))



T_time = C // B if C % B == 0 else C // B + 1

A_time = A // D if A % D == 0 else A // D + 1



if T_time <= A_time :

  print("Yes")

else :

  print("No")

A, B, C, D = list(map(int, input().split()))
T_time = C // B
if not C % B == 0:
    T_time += 1
A_time = A // D
if not A % D == 0:
    A_time += 1
if T_time <= A_time:
    print("Yes")
else:
    print("No")

A, B, C, D = list(map(int, input().split()))
T_time = C // B if C % B == 0 else C // B + 1
A_time = A // D if A % D == 0 else A // D + 1
if T_time <= A_time:
    print("Yes")
else:
    print("No")

-T_time = C // B -if not C % B == 0: -    T_time += 1 -A_time = A // D -if not A % D == 0: -    A_time += 1 +T_time = C // B if C % B == 0 else C // B + 1 +A_time = A // D if A % D == 0 else A // D + 1