x = str(input())
z = []
z =  x.split()

N = int(z[0])
M = int(z[1])
L = int(z[2])
R = int(z[3])
a = []
b = []
m = 0
for i in range(N):
    if (N % (i + 1) == 0):
        a.append(i + 1)

for i in range(M):
    if (M % (i + 1) == 0):
        b.append(i + 1)

for i in range(len(a)):
    for j in range(len(b)):
        if L <= a[i] * b[j] <= R:
            m += 1

print(m)