# -*- coding: utf-8 -*-

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

ab = a*b if b%a!=0 else b
bc = b*c if c%b!=0 else c
ca = c*a if c%a!=0 else c

abc = a*b*c
if ab == b or ca == c:
    abc //= a
if bc == c:
    abc //= b

a_num = N//a
b_num = N//b
c_num = N//c
ab_num = N//ab
bc_num = N//bc
ca_num = N//ca
abc_num = N//abc

print(a_num + b_num + c_num - ab_num - bc_num - ca_num + abc_num)