import math

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

lcm_ab = abs(a * b) // math.gcd(a, b)
lcm_ac = abs(a * c) // math.gcd(a, c)
lcm_bc = abs(b * c) // math.gcd(b, c)
lcm_abc = abs(lcm_ab * c) // math.gcd(lcm_ab, c)

print((n // a) + (n // b) + (n // c) - (n // lcm_ab) - (n // lcm_ac) - (n // lcm_bc) + (n // lcm_abc))