### BUGGY CODE ###

import sys
input = sys.stdin.readline


h,w=map(int,input().split())
#s=[[]*w for i in range(h)]
#s=[]*h
s=[[] for i in range(h)]
for i in range(h):
#    s[i]=list(input())
    si=input()
#    s[i].append(si)
    s[i]=si
"""
h,w=4,6
s=[['#', '.', '.', '#', '.', '.'], ['.', '.', '.', '.', '.', '#'], ['.', '.', '.', '.', '#', '.'], ['#', '.', '#', '.', '.', '.']]    
"""
ww=[[0]*w for i in range(h)]
for i in range(h):
    jsum=0
    jst=0
    jed=0
    for j in range(w):
        if s[i][j]==".":
            jsum+=1
            jst=min(j,jst)
            jed=max(j,jed)
        else:
#            print(jsum,jst,jed)
            if jsum!=0:
                for jj in range(jst,jed+1):
                    ww[i][jj]=jsum
            jsum=0
            jst=j+1
            jed=j+1
        if jst<w:
            for jj in range(jst,jed+1):
                ww[i][jj]=jsum
                
hh=[[0]*w for i in range(h)]
for j in range(w):
    isum=0
    ist=0
    ied=0
    for i in range(h):
        if s[i][j]==".":
            isum+=1
            ist=min(i,ist)
            ied=max(i,ied)
        else:
#            print(isum,ist,ied)
            if isum!=0:
                for ii in range(ist,ied+1):
                    hh[ii][j]=isum
            isum=0
            ist=i+1
            ied=i+1
        if ist<h:
            for ii in range(ist,ied+1):
                hh[ii][j]=isum
            
ijmax=0
for i in range(h):
    for j in range(w):
        if s[i][j]==".":
            ijmax=max(ijmax,ww[i][j]+hh[i][j]-1)

print(ijmax)
                

### FIXED CODE ###

import sys
input = sys.stdin.readline

h,w=map(int,input().split())
s=[[] for i in range(h)]
for i in range(h):
    si=input()
    s[i]=si
"""
h,w=4,6
s=[['#', '.', '.', '#', '.', '.'], ['.', '.', '.', '.', '.', '#'], ['.', '.', '.', '.', '#', '.'], ['#', '.', '#', '.', '.', '.']]    
"""
ww=[[0]*w for i in range(h)]
#www=[[0]*w for i in range(h)]
www=[0]*w
for i in range(h):
    jsum=0
    jcnt=1
    jj=[0]*(w+1)
    for j in range(w):
        if s[i][j]==".":
#            www[i][j]=jcnt
            www[j]=jcnt
            if j<w-1 and s[i][j+1]=="#":
                jcnt+=1
            jsum+=1
        else:
#            print(jsum,jst,jed)
            if jsum!=0:
                jj[jcnt-1]=jsum
            jsum=0
    jcnt+=1
    jj[jcnt-1]=jsum
            
    for j in range(w):
        if s[i][j]==".":
#            ww[i][j]=jj[www[i][j]]
            ww[i][j]=jj[www[j]]
#    print(jj)
                
hh=[[0]*w for i in range(h)]
hhh=[0]*h
for j in range(w):
    isum=0
    icnt=1
    ii=[0]*(h+1)
    for i in range(h):
        if s[i][j]==".":
#            www[i][j]=jcnt
            hhh[i]=icnt
            if i<h-1 and s[i+1][j]=="#":
                icnt+=1
            isum+=1
        else:
#            print(jsum,jst,jed)
            if isum!=0:
                ii[icnt-1]=isum
            isum=0
    icnt+=1
    ii[icnt-1]=isum
            
    for i in range(h):
        if s[i][j]==".":
#            ww[i][j]=jj[www[i][j]]
            hh[i][j]=ii[hhh[i]]
#    print(jj)
            
ijmax=0
for i in range(h):
    for j in range(w):
        if s[i][j]==".":
            ijmax=max(ijmax,ww[i][j]+hh[i][j]-1)

print(ijmax)