n = int(input())

a, b, c = [ int(v) for v in input().split(" ") ]


def gcm(a,b):
    if a > b:
        a, b = b, a
    while a != 0:
        a, b = b % a, a
    return b

def lgm(a,b):
    return a*b//gcm(a,b)

def lgm3(a,b,c):
    return lgm(lgm(a,b),c)


nlist = [ n//a, n//b, n//c, -(n//(lgm(a,b))), -(n//(lgm(b,c))), -(n//(lgm(c,a))), n//(lgm3(a,b,c)) ]


print(sum(nlist))