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

t_q, t_d = divmod(C, B)

a_q, a_d = divmod(A, D)

t_eq = t_q if t_d == 0 else t_q + 1

a_eq = a_q if a_d == 0 else a_q + 1

if t_eq <= a_eq:

    print('Yes')

else:

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

t_eq = -(-C//B)

a_eq = -(-A//D)

if t_eq <= a_eq:

    print('Yes')

else:

    print('No')
A, B, C, D = list(map(int, input().split()))
t_q, t_d = divmod(C, B)
a_q, a_d = divmod(A, D)
t_eq = t_q if t_d == 0 else t_q + 1
a_eq = a_q if a_d == 0 else a_q + 1
if t_eq <= a_eq:
    print("Yes")
else:
    print("No")

A, B, C, D = list(map(int, input().split()))
t_eq = -(-C // B)
a_eq = -(-A // D)
if t_eq <= a_eq:
    print("Yes")
else:
    print("No")

-t_q, t_d = divmod(C, B) -a_q, a_d = divmod(A, D) -t_eq = t_q if t_d == 0 else t_q + 1 -a_eq = a_q if a_d == 0 else a_q + 1 +t_eq = -(-C // B) +a_eq = -(-A // D)