l, r, m, k = map(int, input().split())

if k == 0:
    print('Yes')
    exit()

il = (l-1)//m
ir = r//m

import math
g = math.gcd(k, m)

if g == 1:
    if ir-il >= 1:
        print('Yes')
    else:
        print('No')
else:
    pl = l%m
    pr = r%m
    p = m//g
    if r-l+1 >= m:
        print('Yes')
    else:
        if pl <= pr:
            if pl <= p <= pr:
                print('Yes')
            else:
                print('No')
        else:
            if 0 <= p <= pr or pl <= p <= m-1:
                print('Yes')
            else:
                print('No')