import math

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

print(("Yes" if math.ceil(A/D)>=math.ceil(C/B) else "No"))
A,B,C,D=list(map(int,input().split()))

print(("Yes" if (A+D-1)//D>=(C+B-1)//B else "No"))
import math

A, B, C, D = list(map(int, input().split()))
print(("Yes" if math.ceil(A / D) >= math.ceil(C / B) else "No"))

A, B, C, D = list(map(int, input().split()))
print(("Yes" if (A + D - 1) // D >= (C + B - 1) // B else "No"))

-import math - -print(("Yes" if math.ceil(A / D) >= math.ceil(C / B) else "No")) +print(("Yes" if (A + D - 1) // D >= (C + B - 1) // B else "No"))