S=gets.chomp
K=gets.chomp.to_i

if S.size == 1
  puts K/2
else
  have_to_change_count = S.scan(/(.)\1+?/).size
  if S[0] == S[-1] && (S[0] != S[1] && S[-1] != S[-2])
    puts (have_to_change_count + 1)*K
  else
    puts have_to_change_count*K
  end
end
