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    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String s = in.next();
        long n = in.nextLong();
        long count =0;
        for(char c : s.toCharArray())
            if(c == 'a')
            count++;
    
         long factor = (n/s.length());
         long rem = (n%s.length());
         count =  factor*count  ;
        for(int i=0;i<rem;i++)
            if(s.charAt(i)=='a')
                    count++;        
        System.out.println(count);
    
    
    
    }