n=gets.to_i
c, v=gets.split.map(&:to_i)

def f(n)
  rt=[]
  (1..n).each do |i|
    break if i*i>n
    if n%i==0
      rt<< i
      rt<< n/i
    end
  end
  rt
end

inf=10**18
dp=Array.new(2*n){inf}
dp[0]=dp[1]=0
(2...(2*n)).each do |i|
  # dd=f(i)
  (1..i).each do |dd|
    # r=(i-d+d-1)/d
    # dp[i]=[dp[i], dp[d]+c+r*v].min
    break if dd*dd>i
    next if i%dd!=0
    d=i/dd
    dp[i]=[dp[i], dp[d]+c+(i-1)/d*v].min
    if d!=dd
      dp[i]=[dp[i], dp[dd]+c+(i-1)/dd*v].min
    end
  end
end

puts dp[n...(2*n)].min
=begin

  L+l*cn>=LL, cn>=(LL-L)/l ... V*cn
  L+L*cm>=LL, cm>=(LL-L)/L ... V*cm+C

=end