qwertyui

def gcd(b, d):
    while d and b:
        if d > b:
            d %= b
        else:
            b %= d
    return b + d


def lcd(b, d):
    bd = b * d
    return bd // gcd(b, d)


a, b, c, d, N, n = map(int, input().split())
tA = a
tC = c
z = a / b
x = c / d
common_denominator = lcd(b, d)
a *= common_denominator / b
c *= common_denominator / d
ans_n = 0
f = 0
ans_list = []
for i in range(1, N + 1):
    t_m1, t_m2 = i, common_denominator
    temp_a = int((a * t_m1) // t_m2)
    temp_c = int((c * t_m1) // t_m2)
    for j in range(temp_a + 1, min(temp_c + 1, N + 1)):
        v = j / i
        if gcd(j, i) == 1 and v != z and v != x:
            ans_n += 1
            ans_list.append([j, i])
        if ans_n == n:
            f = 1
            break
    if f == 1:
        break
print(ans_n)
for i in range(ans_n):
    print(*ans_list[i])