content: package v115;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.util.StringTokenizer;
  
  
  public class GettingGold_UVa11561 {
  	
  	static int R, C;
  	static char[][] grid;
  	static int[] dx = new int[] { -1, 1, 0, 0 };
  	static int[] dy = new int[] { 0, 0, -1, 1 };
  
  	static int dfs(int i, int j)
  	{
  		int ret = 0;
  		if(grid[i][j] == 'G')
  			++ret;
  		grid[i][j] = '#';
  		if(!nearTrap(i, j))
  			for(int k = 0; k < 4; ++k)
  			{
  				int x = i + dx[k], y = j + dy[k];
  				if(grid[x][y] != '#')
  					ret += dfs(x, y);
  			}
  		return ret;
  	}
  	
  	static boolean nearTrap(int i, int j)
  	{
  		for(int k = 0; k < 4; ++k)
  			if(grid[i + dx[k]][j + dy[k]] == 'T')
  				return true;
  		return false;
  	}
  	
  	public static void main(String[] args) throws IOException 
  	{
  		Scanner sc = new Scanner(System.in);
  		PrintWriter out = new PrintWriter(System.out);
  		
  		while(sc.ready())
  		{
  			C = sc.nextInt();
  			R = sc.nextInt();
  			grid = new char[R][C];
  			int x = -1, y = -1;
  			for(int i = 0; i < R; ++i)
  			{
  				String s = sc.next();
  				for(int j = 0; j < C; ++j)
  				{
  					if(s.charAt(j) == 'P')
  					{
  						x = i; y = j;
  					}
  					grid[i][j] = s.charAt(j);
  				}
  			}
  			out.println(dfs(x, y));
  		}
  		out.flush();
  		out.close();
  	}
  
  	static class Scanner 
  	{
  		StringTokenizer st;
  		BufferedReader br;
  
  		public Scanner(InputStream s){	br = new BufferedReader(new InputStreamReader(s));}
  
  		public String next() throws IOException 
  		{
  			while (st == null || !st.hasMoreTokens()) 
  				st = new StringTokenizer(br.readLine());
  			return st.nextToken();
  		}
  
  		public int nextInt() throws IOException {return Integer.parseInt(next());}
  
  		public long nextLong() throws IOException {return Long.parseLong(next());}
  
  		public String nextLine() throws IOException {return br.readLine();}
  
  		public double nextDouble() throws IOException
  		{
  			String x = next();
  			StringBuilder sb = new StringBuilder("0");
  			double res = 0, f = 1;
  			boolean dec = false, neg = false;
  			int start = 0;
  			if(x.charAt(0) == '-')
  			{
  				neg = true;
  				start++;
  			}
  			for(int i = start; i < x.length(); i++)
  				if(x.charAt(i) == '.')
  				{
  					res = Long.parseLong(sb.toString());
  					sb = new StringBuilder("0");
  					dec = true;
  				}
  				else
  				{
  					sb.append(x.charAt(i));
  					if(dec)
  						f *= 10;
  				}
  			res += Long.parseLong(sb.toString()) / f;
  			return res * (neg?-1:1);
  		}
  
  		public boolean ready() throws IOException {return br.ready();}
  
  
  	}
  }