g(a,b){return a?g(b%a,a):b;}
main(n,a,b,c,d){
	scanf("%d%d%d%d",&n,&a,&b,&c);
	d=a*b/g(a,b);
	printf("%d",n/a+n/b+n/c-n/d-n*g(a,c)/a/c-n*g(b,c)/b/c+n*g(c,d)/c/d);
	return 0;
}