n=input()
a,b,c=map(int,raw_input().split())
#print sum(1 for i in xrange(1,n+1)if i%a==0 or i%b==0 or i%c==0)
def s(a,b):
	x=a
	y=b
	while x!=y:
		while x<y:x+=a
		while y<x:y+=b
	return x
def ss(a,b,c):
	return s(s(a,b),c)
print n/a+n/b+n/c-n/s(a,b)-n/s(a,c)-n/s(b,c)+n/ss(a,b,c)