import java.io.*; import java.util.*; import java.math.*; // import java.awt.Point; public class Main { InputStream is; PrintWriter out; String INPUT = ""; long MOD = 1_000_000_007; long inf = Long.MAX_VALUE; void solve(){ int n = ni(); char[][] map = nm(n,n); char[][] nmap = new char[n][n]; int ans = 0; for(int r = 0; r < 8; r++){ for(int i = 0; i < n; i++){ for(int j = 0; j < n; j++){ if(r==0){ nmap[i][j] = map[i][j]; } if(r==1){ nmap[i][j] = map[n-1-i][j]; } if(r==2){ nmap[i][j] = map[n-1-i][n-1-j]; } if(r==3){ nmap[i][j] = map[i][n-1-j]; } if(r==4){ nmap[i][j] = map[j][i]; } if(r==5){ nmap[i][j] = map[n-1-j][i]; } if(r==6){ nmap[i][j] = map[n-1-j][n-1-i]; } if(r==7){ nmap[i][j] = map[j][n-1-i]; } } } // for(int i = 0; i < n; i++){ // for(int j = 0; j < n; j++){ // out.print(nmap[i][j]); // } // out.println(); // } // out.println(f(nmap,n)); // out.println(); ans = Math.max(f(nmap,n), ans); } out.println(ans); } int f(char[][] map, int n){ int ans = 0; int res = 0; for(int i = 0; i < n; i++){ res = 0; for(int j = 0; j < 1; j++){ for(int k = j; k < j+n-1; k++){ if(map[i][k]=='#'){ res = 0; break; } res = 1; } if(res==1){ ans++; break; } } } int ans2 = 0; for(int k = 0; k < 1; k++){ res = 0; for(int i = k; i < k+n-1; i++){ if(map[i][0]=='#'){ res = 0; break; } res = 1; } if(res==1){ ans2++; break; } } res = 0; for(int i = 0; i < n; i++){ for(int k = 1; k < n; k++){ if(map[i][k]=='#'){ res = 0; break; } res = 1; } if(res==1) ans2++; } ans = Math.max(ans,ans2); int ans3 = 0; res = 0; for(int i = 0; i < n-1; i++){ if(map[i][0]=='#'){ res = 0; break; } res = 1; } if(res==1){ ans3++; } res = 0; for(int i = 0; i < n-1; i++){ for(int k = 1; k < n; k++){ if(map[i][k]=='#'){ res = 0; break; } res = 1; } if(res==1) ans3++; } res = 0; for(int j = 0; j < n-1; j++){ if(map[n-1][j]=='#'){ res = 0; break; } res = 1; } if(res==1) ans3++; ans = Math.max(ans,ans3); int ans4 = 0; res = 0; for(int i = 0; i < n-1; i++){ if(map[i][0]=='#'){ res = 0; break; } res = 1; } if(res==1) ans4++; res = 0; for(int i = 0; i < n-1; i++){ if(map[n-1][i]=='#'){ res = 0; break; } res = 1; } if(res==1) ans4++; res = 0; for(int i = 0; i < n-1; i++){ if(map[i+1][n-1]=='#'){ res = 0; break; } res = 1; } if(res==1) ans4++; res = 0; for(int i = 0; i < n-1; i++){ if(map[0][i+1]=='#'){ res = 0; break; } res = 1; } if(res==1) ans4++; ans = Math.max(ans,ans4); return ans; } void run() throws Exception { is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes()); out = new PrintWriter(System.out); long s = System.currentTimeMillis(); solve(); out.flush(); if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms"); } public static void main(String[] args) throws Exception { new Main().run(); } private byte[] inbuf = new byte[1024]; private int lenbuf = 0, ptrbuf = 0; 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; } private double nd() { return Double.parseDouble(ns()); } private char nc() { return (char)skip(); } private String ns() { int b = skip(); StringBuilder sb = new StringBuilder(); while(!(isSpaceChar(b) && b != ' ')){ sb.appendCodePoint(b); b = readByte(); } return sb.toString(); } private char[] ns(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); } private char[][] nm(int n, int m) { char[][] map = new char[n][]; for(int i = 0;i < n;i++)map[i] = ns(m); return map; } private int[] na(int n) { int[] a = new int[n]; for(int i = 0;i < n;i++)a[i] = ni(); return a; } private int ni() { 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(); } } private long nl() { 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 void tr(Object... o) { System.out.println(Arrays.deepToString(o)); } }