import math

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

def lcm(x, y):
    return x * y // math.gcd(x, y)

ab = lcm(a, b)
ac = lcm(a, c)
bc = lcm(b, c)
abc = lcm(ab, c)

count_a = n // a
count_b = n // b
count_c = n // c

count_ab = n // ab
count_ac = n // ac
count_bc = n // bc

count_abc = n // abc

total = count_a + count_b + count_c - count_ab - count_ac - count_bc + count_abc

print(total)