def solve_short(d,a,b,c) begin r=0_i64 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 rescue DivisionByZeroError -1 end end def solve_tall(d,a,b,c) begin r=0_i64 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 || c==a ? -1 : r rescue DivisionByZeroError -1 end 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