import math

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

p_a = N // a
p_b = N // b
p_c = N // c
p_ab = N // (a*b)
p_bc = N // (b*c)
p_ca = N // (c*a)
p_abc = N // (a*b*c)



if math.gcd(math.gcd(a,b),c) == min(a,b,c):
    print(N// min(a,b,c))
elif math.gcd(a,b) == min(a,b):
    print(p_c + (N // min(a, b)) - (N // (min(a,b) * c)) )
elif math.gcd(b,c) == min(b,c):
    print(p_a + (N // min(b, c)) - (N // (min(b,c) * a)) )
elif math.gcd(c,a) == min(c,a):
    print(p_b + (N // min(c, a)) - (N // (min(c,a) * b)) )
else:
    print(p_a + p_b + p_c - p_ab - p_bc - p_ca + p_abc)