#include<iostream>
#include<map>
#include<set>
#include<string>
#include<algorithm>
#include<cmath>
#include<vector>
#include<queue>
#include<stack>
#include<limits>
#include<sstream> 
#include<unordered_map>      

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef int itn;
typedef vector<int> vi;
typedef vector<ll> vl;

const int inf = numeric_limits<int>::max() >> 2;
const ll linf = numeric_limits<ll>::max() >> 2;
const ull ulinf = numeric_limits<ull>::max() >> 2;
const double pi = acos(-1);
const int dx[4]={1,0,-1,0};
const int dy[4]={0,1,0,-1};
const int dx8[8]={-1,0,1,-1,1,-1,0,1};
const int dy8[8]={-1,-1,-1,0,0,1,1,1};

#define p_queue(i) priority_queue<i> 
#define rp_queue(i) priority_queue<i, vector<i>, greater<i>> 
#define umap(i,j) unordered_map<i,j>
#define P(p) cout<<(p)<<endl
#define PS(p) cout<<(p)<< " "
#define IN cin >> 
#define rep(i,m,n) for(int i = (m); i < (int)(n); i++)
#define rrep(i,m,n) for(int i = (m-1); i >= (int)(n); i--)
#define inrep(n,a) for(int i = 0; i < (int)(n); i++)cin >> a[i];
#define mod(i) ((i)%(ll)(1e9 + 7))
#define divm(a,b) (mod(a * modpow((ll)b,(ll)(1e9+5))))
#define rsort(a,b,c) sort(a, b, greater<c>())
#define vsort(v) sort(v.begin(), v.end())
#define rvsort(v,c) sort(v.begin(), v.end(), greater<c>()) 
#define ft first
#define sd second
#define pb push_back
#define it insert
#define sz(x) ((int)(x).size())
#define lb(a,n,k) (lower_bound(a,a+n,k) - a) 
#define vlb(a,k)  (lower_bound(a.begin(),a.end(),k) - a.begin())
#define ub(a,n,k) (upper_bound(a,a+n,k) - a) 
#define vub(a,k)  (upper_bound(a.begin(),a.end(),k) - a.begin())
#define YES cout<<"YES"<< endl
#define NO cout<<"NO"<<endl
#define Yes cout<<"Yes"<<endl
#define No cout<<"No"<<endl  
#define yes cout<<"yes"<<endl
#define no cout<<"no"<<endl
#define ret return

ll modpow(ll i,ll j){ ll tmp=1; while(j){ if(j%2)tmp=mod(tmp*i);i=mod(i*i);j/=2;}return tmp;}
ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }

vector<string> split(const string &str, char sep){
    vector<string> v;
    stringstream ss(str);
    string buffer;
    while( getline(ss, buffer, sep) ) {
        v.push_back(buffer);
    }
    return v;
}

//ll ncr[100][100];
//ll nCr(int n, int r){if(n==r) ret ncr[n][r] = 1; if(r==0) ret ncr[n][r] = 1; if(r==1) ret ncr[n][r] = n;if(ncr[n][r]) ret ncr[n][r]; ret ncr[n][r] = nCr(n-1,r) + nCr(n-1,r-1);}

//ll npr[100][100]={};
//ll nPr(int n,int r){if(npr[n][r])ret npr[n][r];if(r==0)ret npr[n][r] = 1;if(r==1)ret npr[n][r] = n;ret npr[n][r] = n * nPr(n-1,r-1);}

//ll nHr(int n,int r){ret nCr(n+r-1,r);}

///////////////////////////////////////////////////////////////////////////


int main(){
    
   
    int h,w;
    cin >> h >> w;
    string s[h];
    inrep(h,s);

    int wl[h][w] = {},wr[h][w] = {};
    rep(i,0,h){
	if(s[i][0] == '.')wl[i][0] = 1;
	rep(j,1,w){
	    wl[i][j] = wl[i][j-1];
	    if(s[i][j] == '.')wl[i][j] += 1;
	    else wl[i][j] = 0;
	}

	if(s[i][w-1] == '.')wr[i][w-1] = 1;
	rrep(j,w-1,0){
	    wr[i][j] = wr[i][j+1];
	    if(s[i][j] == '.')wr[i][j] += 1;
	    else wr[i][j] = 0;
	}
    }


    int hl[h][w] = {},hr[h][w] = {};
    rep(j,0,w){
	if(s[0][j] == '.')hl[0][j] = 1;
	rep(i,1,h){
	    hl[i][j] = hl[i-1][j];
	    if(s[i][j] == '.')hl[i][j] += 1;
	    else hl[i][j] = 0;
	}

	if(s[h-1][j] == '.')hr[h-1][j] = 1;
	rrep(i,h-1,0){
	    hr[i][j] = hr[i+1][j];
	    if(s[i][j] == '.')hr[i][j] += 1;
	    else hr[i][j] = 0;
	}
    }


    /*   rep(i,0,h){
	rep(j,0,w)PS(hr[i][j]);
	cout << endl;
	}*/
    
    int ans = 0;

    rep(i,0,h){
	rep(j,0,w){
	    if(s[i][j] == '.')ans = max(ans, (wl[i][j] + wr[i][j] - 1) + (hl[i][j] + hr[i][j] - 1) - 1 );
	}
    }

    P(ans);
    return  0;
}


Measured memory_bytes: 66816