import math

n = int(input())
a, b, c = map(int, input().split())

# print("n:{}".format(n))
# print("a:{} b:{} c:{}".format(a, b, c))

a_div_nums = n // a
b_div_nums = n // b
c_div_nums = n // c
# print("a_div_nums:{} b_div_nums:{} c_div_nums:{}".format(a_div_nums, b_div_nums, c_div_nums))

ab_gcd = math.gcd(a, b)
bc_gcd = math.gcd(b, c)
ca_gcd = math.gcd(c, a)
# print("ab_gcd:{} bc_gcd:{} ca_gcd:{}".format(ab_gcd, bc_gcd, ca_gcd))

ab_lcm = (a * b) // ab_gcd
bc_lcm = (b * c) // bc_gcd
ca_lcm = (c * a) // ca_gcd
# print("ab_lcm:{} bc_lcm:{} ca_lcm:{}".format(ab_lcm, bc_lcm, ca_lcm))

abc_gcd = math.gcd(a, bc_lcm)
abc_lcm = (a * bc_lcm) // abc_gcd
# print("abc_gcd:{}".format(abc_gcd))
# print("abc_lcm:{}".format(abc_lcm))

total = a_div_nums + b_div_nums + c_div_nums
total = total - n // ab_lcm - n // bc_lcm - n // ca_lcm
total = total + n // abc_lcm

print(total)