#!/usr/bin/env crystal
def solve_short(d,a,b,c)
	r=0
	if a==c
		c=[0,c-d].max
		r+=1
	end
	t=b-[a,c].min+1
	if t>0
		cnt=(t+d-1)/d
		r+=cnt
		b=[0,b-r*d].max
	end
	a==b || b==c ? -1 : r
end
def solve_tall(d,a,b,c)
	r=0
	t=a-b+1
	if t>0
		cnt=(t+d-1)/d
		r+=cnt
		a=[0,a-cnt*d].max
	end
	t=c-b+1
	if t>0
		cnt=(t+d-1)/d
		r+=cnt
		c=[0,c-cnt*d].max
	end
	if a==c
		c=[0,c-d].max
		r+=1
	end
	a==b || b==c ? -1 : r
end
d,a,b,c=4.times.map{gets.not_nil!.to_i}.to_a
x=solve_short(d,a,b,c)
y=solve_tall(d,a,b,c)
p x>=0&&y>=0 ? [x,y].min : [x,y].max