a, b, c, d = map(int, input().split())

t_attack_cnt = (c + b - 1) // b

a_attack_cnt = (a + d - 1) // d

print('Yes') if t_attack_cnt <= a_attack_cnt else print('No')

a, b, c, d = map(int, input().split())

print('Yes') if (c + b - 1) // b <= (a + d - 1) // d else print('No')

a, b, c, d = map(int, input().split())
t_attack_cnt = (c + b - 1) // b
a_attack_cnt = (a + d - 1) // d
print("Yes") if t_attack_cnt <= a_attack_cnt else print("No")

a, b, c, d = map(int, input().split())
print("Yes") if (c + b - 1) // b <= (a + d - 1) // d else print("No")

-t_attack_cnt = (c + b - 1) // b -a_attack_cnt = (a + d - 1) // d -print("Yes") if t_attack_cnt <= a_attack_cnt else print("No") +print("Yes") if (c + b - 1) // b <= (a + d - 1) // d else print("No")