from fractions import gcd
N = int(input())
a, b, c = map(int, input().split())

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

print(N//a + N//b + N//c - N//lcm(a,b) - N//lcm(b,c) - N//lcm(c,a) + N//lcm(b,lcm(c,a)))