import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

n = I()
a, b, c = MI()

g_abc = math.lcm(a, b, c)
g_ab = math.lcm(a, b)
g_ac = math.lcm(a, c)
g_bc = math.lcm(b, c)

ans = n//a + n//b + n//c - (n//g_ab + n//g_ac + n//g_bc) + n//g_abc
print(ans)