n = read_line.to_i
c, v = read_line.split.map &.to_i
dp = Array.new(n + 1) { Hash(Int32, Int32).new(10 ** 9) }
dp[2][1] = c + v

(2...n).each do |len|
  dp[len].each do |clip, cost|
    dp[{len + clip, n}.min][clip] = {cost + v, dp[{len + clip, n}.min][clip]}.min
    dp[{len + len, n}.min][len] = {cost + c + v, dp[{len + len, n}.min][len]}.min
  end
end
puts dp[n].values.min