import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

from fractions import gcd
from functools import reduce

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

def f(*args):
    lcm = reduce(lambda x,y: x*y//gcd(x,y), args, 1)
    return N//lcm

answer = f(a) + f(b) + f(c) - f(a,b) - f(a,c) - f(b,c) + f(a,b,c)
print(answer)