# include <iostream>
# include <cstring>
# include <algorithm>
using namespace std;
int n,m;
int v[ 110 ][ 110 ], drum[ 110 ][ 110 ];
char c;
int maxim = 0;
int main()
{
    cin >> n >> m;
    cin.get();
    for( int i = 1; i <= n; ++i )
    {
        for( int j = 1; j <= m; ++j )
        {
            cin >> c;
            if( c == '&' )
                v[ i ][ j ] = 0;
            else
                v[ i ][ j ] = 1;
            if( v[ i ][ j ] != 0 )
                drum[ i ][ j ] = max( drum[ i - 1 ][ j ], drum[ i ][ j - 1  ] ) + v[ i ][ j ];
            maxim = max( maxim, drum[ i ][ j ] );
        }
        cin.get();
    }
    cout << maxim;
}