import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import java.nio.charset.Charset;
import java.util.*;


public class Main {
    public static void main(String[] args) throws Exception {
        boolean local = false;
        boolean async = true;

        Charset charset = Charset.forName("ascii");

        FastIO io = local ? new FastIO(new FileInputStream("D:\\DATABASE\\TESTCASE\\Code.in"), System.out, charset) : new FastIO(System.in, System.out, charset);
        Task task = new Task(io, new Debug(local));

        if (async) {
            Thread t = new Thread(null, task, "skypool", 1 << 27);
            t.setPriority(Thread.MAX_PRIORITY);
            t.start();
            t.join();
        } else {
            task.run();
        }

        if (local) {
            io.cache.append("\n\n--memory -- \n" + ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) >> 20) + "M");
        }

        io.flush();
    }

    public static class Task implements Runnable {
        final FastIO io;
        final Debug debug;
        int inf = (int) 1e9;
        long lInf = (long) 1e18;
        double dInf = 1e50;

        public Task(FastIO io, Debug debug) {
            this.io = io;
            this.debug = debug;
        }

        @Override
        public void run() {
            solve();
        }

        public void solve() {
            String text = io.readString();
            char[] s = text.toCharArray();
            int k = io.readInt();
            int n = s.length;
            int[][] dp0 = new int[n][2];
            int[][] dp1 = new int[n][2];

            dp0[0][1] = inf;
            dp1[0][0] = inf;
            dp1[0][1] = 1;

            for (int i = 1; i < n; i++) {
                if (s[i] != s[i - 1]) {
                    dp0[i][0] = Math.min(dp0[i - 1][0], dp0[i - 1][1]);
                    dp0[i][1] = dp0[i][0] + 1;

                    dp1[i][0] = Math.min(dp1[i - 1][0], dp1[i - 1][1]);
                    dp1[i][1] = dp1[i][0] + 1;
                } else {
                    dp0[i][0] = dp0[i - 1][1];
                    dp0[i][1] = Math.min(dp0[i - 1][0], dp0[i - 1][1]) + 1;


                    dp1[i][0] = dp1[i - 1][1];
                    dp1[i][1] = Math.min(dp1[i - 1][0], dp1[i - 1][1]) + 1;
                }
            }

            debug.debug("dp0", dp0);
            debug.debug("dp1", dp1);
            DP dp = new DP();
            dp.mat[0][0] = dp0[n - 1][0];
            dp.mat[0][1] = dp0[n - 1][1];
            dp.mat[1][0] = dp1[n - 1][0];
            dp.mat[1][1] = dp1[n - 1][1];

            DP ans = DP.pow(dp, k, s[0] != s[n - 1]);
            long min = lInf;
            for (int i = 0; i < 2; i++) {
                for (int j = 0; j < 2; j++) {
                    min = Math.min(min, ans.mat[i][j]);
                }
            }

            io.cache.append(min);
        }

    }

    public static class DP {
        long[][] mat = new long[2][2];

        public static DP mul(DP a, DP b, boolean allowZero) {
            DP ans = new DP();
            for (int i = 0; i < 2; i++) {
                for (int j = 0; j < 2; j++) {
                    ans.mat[i][j] = Long.MAX_VALUE;
                    for (int k = 0; k < 2; k++) {
                        for (int t = 0; t < 2; t++) {
                            if (k == 0 && t == 0 && !allowZero) {
                                continue;
                            }
                            ans.mat[i][j] = Math.min(ans.mat[i][j], a.mat[i][k] + b.mat[t][j]);
                        }
                    }
                }
            }
            return ans;
        }

        public static DP pow(DP x, int n, boolean allowZero) {
            if (n == 1) {
                return x;
            }
            DP ans = pow(x, n / 2, allowZero);
            ans = mul(ans, ans, allowZero);
            if (n % 2 == 1) {
                ans = mul(ans, x, allowZero);
            }
            return ans;
        }

        @Override
        public String toString() {
            return Arrays.deepToString(mat);
        }
    }


    public static class FastIO {
        public final StringBuilder cache = new StringBuilder(20 << 20);
        private final InputStream is;
        private final OutputStream os;
        private final Charset charset;
        private StringBuilder defaultStringBuf = new StringBuilder(1 << 8);
        private byte[] buf = new byte[1 << 20];
        private int bufLen;
        private int bufOffset;
        private int next;

        public FastIO(InputStream is, OutputStream os, Charset charset) {
            this.is = is;
            this.os = os;
            this.charset = charset;
        }

        public FastIO(InputStream is, OutputStream os) {
            this(is, os, Charset.forName("ascii"));
        }

        private int read() {
            while (bufLen == bufOffset) {
                bufOffset = 0;
                try {
                    bufLen = is.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
                if (bufLen == -1) {
                    return -1;
                }
            }
            return buf[bufOffset++];
        }

        public void skipBlank() {
            while (next >= 0 && next <= 32) {
                next = read();
            }
        }

        public int readInt() {
            int sign = 1;

            skipBlank();
            if (next == '+' || next == '-') {
                sign = next == '+' ? 1 : -1;
                next = read();
            }

            int val = 0;
            if (sign == 1) {
                while (next >= '0' && next <= '9') {
                    val = val * 10 + next - '0';
                    next = read();
                }
            } else {
                while (next >= '0' && next <= '9') {
                    val = val * 10 - next + '0';
                    next = read();
                }
            }

            return val;
        }

        public long readLong() {
            int sign = 1;

            skipBlank();
            if (next == '+' || next == '-') {
                sign = next == '+' ? 1 : -1;
                next = read();
            }

            long val = 0;
            if (sign == 1) {
                while (next >= '0' && next <= '9') {
                    val = val * 10 + next - '0';
                    next = read();
                }
            } else {
                while (next >= '0' && next <= '9') {
                    val = val * 10 - next + '0';
                    next = read();
                }
            }

            return val;
        }

        public double readDouble() {
            boolean sign = true;
            skipBlank();
            if (next == '+' || next == '-') {
                sign = next == '+';
                next = read();
            }

            long val = 0;
            while (next >= '0' && next <= '9') {
                val = val * 10 + next - '0';
                next = read();
            }
            if (next != '.') {
                return sign ? val : -val;
            }
            next = read();
            long radix = 1;
            long point = 0;
            while (next >= '0' && next <= '9') {
                point = point * 10 + next - '0';
                radix = radix * 10;
                next = read();
            }
            double result = val + (double) point / radix;
            return sign ? result : -result;
        }

        public String readString(StringBuilder builder) {
            skipBlank();

            while (next > 32) {
                builder.append((char) next);
                next = read();
            }

            return builder.toString();
        }

        public String readString() {
            defaultStringBuf.setLength(0);
            return readString(defaultStringBuf);
        }

        public int readLine(char[] data, int offset) {
            int originalOffset = offset;
            while (next != -1 && next != '\n') {
                data[offset++] = (char) next;
                next = read();
            }
            return offset - originalOffset;
        }

        public int readString(char[] data, int offset) {
            skipBlank();

            int originalOffset = offset;
            while (next > 32) {
                data[offset++] = (char) next;
                next = read();
            }

            return offset - originalOffset;
        }

        public int readString(byte[] data, int offset) {
            skipBlank();

            int originalOffset = offset;
            while (next > 32) {
                data[offset++] = (byte) next;
                next = read();
            }

            return offset - originalOffset;
        }

        public char readChar() {
            skipBlank();
            char c = (char) next;
            next = read();
            return c;
        }

        public void flush() {
            try {
                os.write(cache.toString().getBytes(charset));
                os.flush();
                cache.setLength(0);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        }

        public boolean hasMore() {
            skipBlank();
            return next != -1;
        }
    }

    public static class Debug {
        private boolean allowDebug;

        public Debug(boolean allowDebug) {
            this.allowDebug = allowDebug;
        }

        public void assertTrue(boolean flag) {
            if (!allowDebug) {
                return;
            }
            if (!flag) {
                fail();
            }
        }

        public void fail() {
            throw new RuntimeException();
        }

        public void assertFalse(boolean flag) {
            if (!allowDebug) {
                return;
            }
            if (flag) {
                fail();
            }
        }

        private void outputName(String name) {
            System.out.print(name + " = ");
        }

        public void debug(String name, int x) {
            if (!allowDebug) {
                return;
            }

            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, long x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, double x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, int[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, long[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, double[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, Object x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, Object... x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.deepToString(x));
        }
    }
}

Measured memory_bytes: 66768