import sys
input = lambda : sys.stdin.readline().rstrip()

sys.setrecursionlimit(2*10**5+10)
write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))


n = int(input())
a,b,c = list(map(int, input().split()))
from math import gcd
ab = a*b//gcd(a,b)
bc = b*c//gcd(b,c)
ca = a*c//gcd(a,c)
abc = ab*c//gcd(ab,c)
ans = n//a + n//b + n//c - n//ab - n//bc - n//ca + n//abc
print(ans)