from math import gcd

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

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

na, nb, nc = N//a, N//b, N//c
nab, nbc, nca = N//lcm(a,b), N//lcm(b,c), N//lcm(c,a)
nabc = N//lcm(lcm(a,b),c)

print(na+nb+nc-nab-nbc-nca+nabc)