def gcd(a,b):
    while b:
        a,b = b, a%b
    return a

def lcm(a,b):
    return a*b / gcd(a, b)

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

divA = N/a
divB = N/b
divC = N/c
div1 = divA + divB + divC

divAB = N/lcm(a, b)
divBC = N/lcm(b, c)
divCA = N/lcm(c, a)
div2 = divAB + divBC + divCA

div3 = N/lcm(a, lcm(b, c))

print div1 - div2 + div3