You are given an array a consisting of n integers. Beauty of array is the maximum sum of some consecutive subarray of this array (this subarray may be empty). For example, the beauty of the array [10, -5, 10, -4, 1] is 15, and the beauty of the array [-3, -5, -1] is 0.

You may choose at most one consecutive subarray of a and multiply all values contained in this subarray by x. You want to maximize the beauty of array after applying at most one such operation.

Input

The first line contains two integers n and x (1 ≤ n ≤ 3 ⋅ 10^5, -100 ≤ x ≤ 100) — the length of array a and the integer x respectively.

The second line contains n integers a_1, a_2, ..., a_n (-10^9 ≤ a_i ≤ 10^9) — the array a.

Output

Print one integer — the maximum possible beauty of array a after multiplying all values belonging to some consecutive subarray x.

Examples

Input


5 -2
-3 8 -2 1 -6


Output


22


Input


12 -3
1 3 3 7 1 3 3 7 1 3 3 7


Output


42


Input


5 10
-1 -2 -3 -4 -5


Output


0

Note

In the first test case we need to multiply the subarray [-2, 1, -6], and the array becomes [-3, 8, 4, -2, 12] with beauty 22 ([-3, 8, 4, -2, 12]).

In the second test case we don't need to multiply any subarray at all.

In the third test case no matter which subarray we multiply, the beauty of array will be equal to 0.
import java.util.*;
import java.io.*;

import static java.lang.Math.max;
import static java.lang.Math.min;
import static java.lang.Math.abs;
import static java.lang.Math.ceil;

public class Hello {
    static InputReader in;
    static PrintWriter out;

    public static void main(String[] args) {
        new Hello().run();
    }

    static class InputReader {
        private final InputStream is;
        private final byte[] inbuf = new byte[1024];
        private int lenbuf = 0;
        private int ptrbuf = 0;

        public InputReader(InputStream stream) {
            is = stream;
        }

        private int readByte() {
            if (lenbuf == -1)
                throw new InputMismatchException();
            if (ptrbuf >= lenbuf) {
                ptrbuf = 0;
                try {
                    lenbuf = is.read(inbuf);
                } catch (IOException e) {
                    throw new InputMismatchException();
                }
                if (lenbuf <= 0)
                    return -1;
            }
            return inbuf[ptrbuf++];
        }

        private boolean isSpaceChar(int c) {
            return !(c >= 33 && c <= 126);
        }

        private int skip() {
            int b;
            while ((b = readByte()) != -1 && isSpaceChar(b))
                ;
            return b;
        }

        public double nextDouble() {
            return Double.parseDouble(nextString());
        }

        public char nextChar() {
            return (char) skip();
        }

        public String nextString() {
            int b = skip();
            StringBuilder sb = new StringBuilder();
            while (!(isSpaceChar(b))) { // when nextLine, (isSpaceChar(b) && b != ' ')
                sb.appendCodePoint(b);
                b = readByte();
            }
            return sb.toString();
        }

        public char[] nextString(int n) {
            char[] buf = new char[n];
            int b = skip(), p = 0;
            while (p < n && !(isSpaceChar(b))) {
                buf[p++] = (char) b;
                b = readByte();
            }
            return n == p ? buf : Arrays.copyOf(buf, p);
        }

        public int nextInt() {
            int num = 0, b;
            boolean minus = false;
            while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'))
                ;
            if (b == '-') {
                minus = true;
                b = readByte();
            }

            while (true) {
                if (b >= '0' && b <= '9') {
                    num = num * 10 + (b - '0');
                } else {
                    return minus ? -num : num;
                }
                b = readByte();
            }
        }

        public long nextLong() {
            long num = 0;
            int b;
            boolean minus = false;
            while ((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'))
                ;
            if (b == '-') {
                minus = true;
                b = readByte();
            }

            while (true) {
                if (b >= '0' && b <= '9') {
                    num = num * 10 + (b - '0');
                } else {
                    return minus ? -num : num;
                }
                b = readByte();
            }
        }
    }

    private static final boolean oj = System.getProperty("ONLINE_JUDGE") != null;

    public static void debug(Object... o) {
        if (!oj) {
            System.out.println(Arrays.deepToString(o));
        }
    }

    // ============================================================================================================

    long[] a;
    int n;
    int x;
    long[][] memo;
    boolean[][] ready;

    long best(int idx, int state) {
        if (idx == -1) {
            return 0;
        }
        if (ready[idx][state]) {
            return memo[idx][state];
        }

        long ret = Long.MIN_VALUE;
        if (state == 0) {
            ret = max(ret, a[idx] + best(idx - 1, 0));
            ret = max(ret, a[idx]);
        } else if (state == 1) {
            ret = max(ret, x * a[idx] + best(idx - 1, 0));
            ret = max(ret, x * a[idx] + best(idx - 1, 1));
            ret = max(ret, x * a[idx]);
        } else {
            ret = max(ret, a[idx] + best(idx - 1, 2));
            ret = max(ret, a[idx] + best(idx - 1, 1));
            ret = max(ret, a[idx]);
        }

        memo[idx][state] = ret;
        ready[idx][state] = true;
        return ret;
    }

    void solve() {
        n = in.nextInt();
        x = in.nextInt();
        a = new long[n];
        Arrays.setAll(a, i -> in.nextInt());

        memo = new long[n][3];
        ready = new boolean[n][3];

        long ans = 0;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < 3; j++) {
                ans = max(ans, best(i, j));
            }
        }

        out.println(ans);
    }

    public void run() {
        in = new InputReader(System.in);
        out = new PrintWriter(System.out);
        int tt = 1;
        // int tt = in.nextInt();
        for (int i = 1; i <= tt; i++) {
            solve();
        }
        out.flush();
    }
}