Problem: There is a grid with H horizontal rows and W vertical columns, and there are obstacles on some of the squares.

Snuke is going to choose one of the squares not occupied by an obstacle and place a lamp on it. The lamp placed on the square will emit straight beams of light in four cardinal directions: up, down, left, and right. In each direction, the beam will continue traveling until it hits a square occupied by an obstacle or it hits the border of the grid. It will light all the squares on the way, including the square on which the lamp is placed, but not the square occupied by an obstacle.

Snuke wants to maximize the number of squares lighted by the lamp.

You are given H strings S_i (1 \leq i \leq H), each of length W. If the j-th character (1 \leq j \leq W) of S_i is `#`, there is an obstacle on the square at the i-th row from the top and the j-th column from the left; if that character is `.`, there is no obstacle on that square.

Find the maximum possible number of squares lighted by the lamp.

Constraints

* 1 \leq H \leq 2,000
* 1 \leq W \leq 2,000
* S_i is a string of length W consisting of `#` and `.`.
* `.` occurs at least once in one of the strings S_i (1 \leq i \leq H).

Input

Input is given from Standard Input in the following format:


H W
S_1
:
S_H


Output

Print the maximum possible number of squares lighted by the lamp.

Examples

Input

4 6
#..#..
.....#
....#.
#.#...


Output

8


Input

4 6
..#..
.....#
....#.
.#...


Output

8


Input

8 8
..#...#.
....#...
......
..###..#
...#..#.
....#.
...#...
.#..#


Output

13

Solution (in JAVA):

Solution:
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.NoSuchElementException;

public class Main {
    public static void main(String[] args) {
        PrintWriter out = new PrintWriter(System.out);
        FastScanner sc = new FastScanner();
        Strategy strategy = new SlowStrategy();
        strategy.solve(out, sc);
        out.flush();
    }
}

class SlowStrategy implements Strategy {
    @Override
    public void solve(PrintWriter out, FastScanner sc) {
        int H = sc.nextInt();
        int W = sc.nextInt();
        MoveInteger[][] rows  = new MoveInteger[H][W];
        MoveInteger[][] cols  = new MoveInteger[H][W];

        String S = sc.next();
        char cur = S.charAt(0);
        if (cur == '.') {
            rows[0][0] = new MoveInteger(1);
            cols[0][0] = new MoveInteger(1);
        } else {
            rows[0][0] = null;
            cols[0][0] = null;
        }
        for (int j=1; j<S.length(); j++) {
            cur = S.charAt(j);
            if (cur == '.') {
                if (rows[0][j-1] == null) {
                    rows[0][j] = new MoveInteger(1);
                } else {
                    rows[0][j] = rows[0][j-1].addI(1);
                }
                cols[0][j] = new MoveInteger(1);
            } else {
                rows[0][j] = null;
                cols[0][j] = null;
            }
        }

        for (int i=1; i<H; i++) {
            S = sc.next();
            cur = S.charAt(0);
            if (cur == '.') {
                if (cols[i-1][0] == null) {
                    cols[i][0] = new MoveInteger(1);
                } else {
                    cols[i][0] = cols[i-1][0].addI(1);
                }
                rows[i][0] = new MoveInteger(1);
            } else {
                rows[i][0] = null;
                cols[i][0] = null;
            }
            for (int j=1; j<S.length(); j++) {
                cur = S.charAt(j);
                if (cur == '.') {
                    if (cols[i-1][j] == null) {
                        cols[i][j] = new MoveInteger(1);
                    } else {
                        cols[i][j] = cols[i-1][j].addI(1);
                    }
                    if (rows[i][j-1] == null) {
                        rows[i][j] = new MoveInteger(1);
                    } else {
                        rows[i][j] = rows[i][j-1].addI(1);
                    }
                } else {
                    rows[i][j] = null;
                    cols[i][j] = null;
                }
            }
        }
        int max = 0;
        for (int i=0; i<H; i++) {
            for (int j=0; j<W; j++) {
                if (rows[i][j] == null || cols[i][j] == null) {
                    continue;
                }
                int val = rows[i][j].toInt() + cols[i][j].toInt() -1;
                if (max < val) {
                    max = val;
                }

            }
        }
        out.println(max);
    }
}

class MoveInteger {
    private int i;
    MoveInteger(int i) {
        this.i = i;
    }

    public int getI() {
        return i;
    }

    public MoveInteger addI(int i) {
        this.i += 1;
        return this;
    }

    public int toInt() {
        return this.i;
    }

    @Override
    public String toString() {
        return String.valueOf(i);
    }
}

interface Strategy {
    void solve(PrintWriter out, FastScanner sc);
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    public boolean hasNext() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++; return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
        return (int) nl;
    }
    public double nextDouble() { return Double.parseDouble(next());}
}