class DoubleBiscuits
    attr_reader :n

    def initialize(n: 0)
        @n = n
    end

    def datainput
        begin
            @n = Integer(gets.chomp)
        rescue
            
        end
    end

    def pocket(number_biscuits)
        cnt = 0
        loop do
            break if number_biscuits <= 2**cnt
            cnt += 1
        end
        return cnt
    end

    def dataoutput
        puts pocket(@n)
    end

    def run
        datainput
        dataoutput
    end
end

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