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 200
 6
 246
 220
 108
 6
 334
 280
 20
 266
 60
 10
 142
 58
 120
 134
 172
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 230
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 46
 74
 54
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 2
 86

import java.io.*;
import java.util.*;

import static java.lang.Math.*;
import static java.util.Arrays.*;

public class ladders443b {
    static BufferedReader __in;
    static PrintWriter __out;
    static StringTokenizer input;

    public static void main(String[] args) throws IOException {
        __in = new BufferedReader(new InputStreamReader(System.in));
        __out = new PrintWriter(new OutputStreamWriter(System.out));

        char[] s = readLine().toCharArray();
        int n = s.length, start = n - 1, k = readInt(), ans = -1;
        next: for(int len = 1; len <= n; ++len, --start) {
            if(k >= len) {
                ans = max(ans, (len << 1) + ((k - len) & -2));
            } else if(((len + k) & -2) > ans) {
                int j = (len + k) >> 1;
                for(int i = 0; j < len; ++i, ++j) {
                    if(s[start + i] != s[start + j]) {
                        continue next;
                    }
                }
                ans = (len + k) & -2;
            }
            // println(len, ans);
        }
        println(ans);

        close();
    }

    static final int IBIG = 1000000007;
    static final int IMAX = 2147483647;
    static final long LMAX = 9223372036854775807L;
    static void read() throws IOException {input = new StringTokenizer(__in.readLine());}
    static String readLine() throws IOException {return __in.readLine();}
    static int nextInt() {return Integer.parseInt(input.nextToken());}
    static int readInt() throws IOException {return Integer.parseInt(__in.readLine());}
    static void print(String s) {__out.print(s);}
    static void println(String s) {__out.println(s);}
    static void print(Object o) {__out.print(o);}
    static void println(Object o) {__out.println(o);}
    static void printy() {__out.println("Yes");}
    static void printY() {__out.println("YES");}
    static void printn() {__out.println("No");}
    static void printN() {__out.println("NO");}
    static void printyn(boolean b) {__out.println(b ? "Yes" : "No");}
    static void printYN(boolean b) {__out.println(b ? "YES" : "NO");}
    static void println(int... a) {for(int i = 0, len = a.length - 1; i < len; __out.print(a[i]), __out.print(' '), i++); __out.println(a[a.length - 1]);}
    static void println(long... a) {for(int i = 0, len = a.length - 1; i < len; __out.print(a[i]), __out.print(' '), i++); __out.println(a[a.length - 1]);}
    static void println() {__out.println();}
    static void close() {__out.close();}
}