def euc(x, y):
	if y == 0: return x
	return euc(y, x%y)

N = int(raw_input())
a, b, c = map(int, raw_input().split())
mab = a * b / euc(a, b)
mbc = b * c / euc(b, c)
mca = c * a / euc(c, a)
mabc = mab * c / euc(mab, c)
print N/a + N/b + N/c - N/mab - N/mbc - N/mca + N/mabc