#include<bits/stdc++.h>
using namespace std;
int n,m;
char a[55][55];
int b[55][55];
int fx[4]={0,1,0,-1};
int fy[4]={1,0,-1,0};
void dfs(int x,int y,int jj){
	b[x][y]=jj;
	for(int i=0;i<=3;i++){
		int tx=x+fx[i];
		int ty=y+fy[i];
		if(tx>=1&&tx<=n&&ty>=1&&ty<=m&&a[tx][ty]=='.'&&jj+1<b[tx][ty]){
			dfs(tx,ty,jj+1);
		}
	}

}
int main(){
    cin>>n>>m;
    for(int i=1;i<=n;i++){
    	for(int j=1;j<=m;j++){
    	    cin>>a[i][j];
    	    b[i][j]=INT_MAX;
        }   
    }
    dfs(1,1,1);
    cout<<b[n][m];
    return 0;
}

/**************************************************************
	Problem: 1432
	User: zengdongxin
	Language: C++
	Result: Accepted
	Time:26 ms
	Memory:2088 kb
****************************************************************/