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

count = 0

while A > 0 and C > 0:

    count += 1

    if count % 2 == 1:

        C -= B

    else:

        A -= D

if count % 2 == 1:

    print('Yes')

else:

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

a = True

while a:

    C -= B

    A -= D

    if C <= 0:

        print('Yes')

        break

    elif A <= 0:

        print('No')

        break
A, B, C, D = list(map(int, input().split()))
count = 0
while A > 0 and C > 0:
    count += 1
    if count % 2 == 1:
        C -= B
    else:
        A -= D
if count % 2 == 1:
    print("Yes")
else:
    print("No")

A, B, C, D = list(map(int, input().split()))
a = True
while a:
    C -= B
    A -= D
    if C <= 0:
        print("Yes")
        break
    elif A <= 0:
        print("No")
        break

-count = 0 -while A > 0 and C > 0: -    count += 1 -    if count % 2 == 1: -        C -= B -    else: -        A -= D -if count % 2 == 1: -    print("Yes") -else: -    print("No") +a = True +while a: +    C -= B +    A -= D +    if C <= 0: +        print("Yes") +        break +    elif A <= 0: +        print("No") +        break