#include using namespace std; #define F first #define S second #define R cin>> #define Z class #define ll long long #define ln cout<<'\n' #define in(a) insert(a) #define pb(a) push_back(a) #define pd(a) printf("%.10f\n",a) #define mem(a) memset(a,0,sizeof(a)) #define all(c) (c).begin(),(c).end() #define iter(c) __typeof((c).begin()) #define rrep(i,n) for(ll i=(ll)(n)-1;i>=0;i--) #define REP(i,m,n) for(ll i=(ll)(m);i<(ll)(n);i++) #define rep(i,n) REP(i,0,n) #define tr(it,c) for(iter(c) it=(c).begin();it!=(c).end();it++) templatevoid pr(A a){cout<void pr(A a,B b){cout<void pr(A a,B b,C c){cout<void pr(A a,B b,C c,D d){cout<void PR(A a,ll n){rep(i,n){if(i)cout<<' ';cout<=0&&x=0&&y P; vector rotate(vector s) { int n=s.size(),m=s[0].size(); vector t(m); rep(i,m)rrep(j,n) t[i]+=s[j][i]; return t; } void Main() { int n; cin >> n; vector s(n); rep(i,n) cin >> s[i]; int ans=0; rep(l,4) { rep(r,2) { int c=0,sum=0; rep(j,n-1) if(s[0][j]=='.') c++; int d[n][2];mem(d); rep(j,n) { rep(i,n-1) if(s[i][j]=='.') d[j][0]++; REP(i,1,n) if(s[i][j]=='.') d[j][1]++; rep(i,2) d[j][i]=d[j][i]==n-1; } if(c==n-1) { sum++; rep(j,n-1) sum+=d[j][1]; sum+=d[n-1][0]||d[n-1][1]; } else { rep(j,n) sum+=d[j][0]||d[j][1]; } ans=max(ans,sum); rep(i,n) reverse(all(s[i])); } s=rotate(s); } pr(ans); } int main(){ios::sync_with_stdio(0);cin.tie(0);Main();return 0;}