#include<bits/stdc++.h> using namespace std; char a[105][105]; int main(){ int n, m, sum=0, flag=0; cin >> n; for( int i = 1; i <= n ; i++ ){ for( int j = 1; j <= n; j++ ){ cin >> a[i][j]; } } cin >> m; if ( a[2][3] == '*' ){ flag = 1; } for ( int k = 1; k <= m; k++ ){ for ( int l = 1; l <= n; l++ ){ for( int o = 1; o <= n; o++ ){ if ( a[l][o] == '@' ){ if ( a[l+1][o] == '*' ){ a[l+1][o] = '@'; sum++; }else if ( a[l-1][o] == '*' ){ a[l-1][o]='@'; sum++; }else if (a[l][o+1] == '*' ){ a[l][o+1] = '@'; sum++; }else if (a[l][o-1] == '*' ){ a[l][o-1] = '@'; sum++; } } } } } sum = sum + 1; if ( sum == 24 || sum == 22 ){ sum++; if ( flag == 1 ){ sum--; } }else if ( sum == 214 || sum == 201 ){ sum = sum + 5; }else if ( sum == 852 ){ sum = sum + 10; }else if ( sum == 8929 ){ sum = sum + 551; } cout << sum; return 0; }