#include <iostream>

using namespace std;
const int dimension=101;
int n,m,nr[dimension][dimension];
char board[dimension][dimension];

int main() {
	cin>>n>>m;
	for(int i=0; i<=n-1; ++i)
        for(int j=0;j<=m-1;j++)
        cin>>board[i][j];
	for(int i=n-1; i>=0; --i)
        for(int j=m-1; j>=0; --j)
		if(board[i][j]!='&')
            nr[i][j]=1+max(nr[i+1][j],nr[i][j+1]);
	cout<<nr[0][0];
}