class Stairs
    attr_reader :s, :f

    def initialize(s: 0, f: 0)
        @s, @f = s, f
    end

    def datainput
        begin
            @s, @f = gets.chomp.split.map { |v| Integer(v) }
        rescue
            
        end
    end

    def stair(s, f)
        s / f + 1
    end

    def dataoutput
        puts stair(@s, @f)
    end

    def run
        datainput
        dataoutput
    end
end

if $0 == __FILE__
    Stairs.new.run
end