nums = [int(e) for e in input().split()]



T = nums[0]

t = nums[1]

A = nums[2]

a = nums[3]

while T > 0 and A > 0:

    A = A - t

    T = T - a



if A <= 0:

    print('Yes')

else:

    print('No')
nums = [int(e) for e in input().split()]



if nums[2]%nums[1] == 0:

    A = nums[2]//nums[1]

else:

    A = nums[2]//nums[1] + 1



if nums[0]%nums[3] == 0:

    T = nums[0]//nums[3]

else:

    T = nums[0]//nums[3] + 1

 

if A <= T:

    print('Yes')

else:

    print('No')
nums = [int(e) for e in input().split()]
T = nums[0]
t = nums[1]
A = nums[2]
a = nums[3]
while T > 0 and A > 0:
    A = A - t
    T = T - a
if A <= 0:
    print("Yes")
else:
    print("No")

nums = [int(e) for e in input().split()]
if nums[2] % nums[1] == 0:
    A = nums[2] // nums[1]
else:
    A = nums[2] // nums[1] + 1
if nums[0] % nums[3] == 0:
    T = nums[0] // nums[3]
else:
    T = nums[0] // nums[3] + 1
if A <= T:
    print("Yes")
else:
    print("No")

-T = nums[0] -t = nums[1] -A = nums[2] -a = nums[3] -while T > 0 and A > 0: -    A = A - t -    T = T - a -if A <= 0: +if nums[2] % nums[1] == 0: +    A = nums[2] // nums[1] +else: +    A = nums[2] // nums[1] + 1 +if nums[0] % nums[3] == 0: +    T = nums[0] // nums[3] +else: +    T = nums[0] // nums[3] + 1 +if A <= T: