n = read_line.to_i64
a, b, c = read_line.split.map &.to_i64

na = n // a
nb = n // b
nc = n // c
nab = n // a.lcm(b)
nbc = n // b.lcm(c)
nca = n // c.lcm(a)
nabc = n // a.lcm(b).lcm(c)

ans = na + nb + nc - nab - nbc - nca + nabc
puts ans