# -*- coding: utf-8 -*-
N = int(input())
a,b,c = map(int,input().split())

aCount = 0
bCount = 0
cCount = 0

for i in range(1,N):
    if i % a == 0 : 
        aCount = aCount +1 
        continue
    if i % b ==0:
        bCount = bCount +1
        continue
    if i % c ==0:
        cCount = cCount +1
        continue



print(aCount + bCount + cCount)