> {$N+}
> program Ball;
>  var N,M:byte;
>      Nail:array [1..50,1..50] of byte;
>      Poss:array [0..50,0..50] of comp;
> 
>  procedure init;
>   var i,j:byte;
>       c:char;
>  begin
>   readln(N,M);
>   for i:=1 to N do
>    for j:=1 to i do
>     begin
>      repeat
>       read(c);
>       until c in ['*','.'];
>      if c='*' then Nail[i,j]:=1
>               else Nail[i,j]:=0;
>     end;
>  end;
> 
>  procedure main;
>   var i,j:byte;
>   begin
>    fillchar(Poss,sizeof(Poss),0);
>    Poss[0,0]:=1;
>    for i:=1 to N do
>     Poss[0,0]:=Poss[0,0]*2;
>    for i:=0 to N-1 do
>     for j:=0 to i do
>      if Nail[i+1,j+1]=0 then Poss[i+2,j+1]:=Poss[i+2,j+1]+Poss[i,j]
> 			else begin
> 			      Poss[i+1,j]:=Poss[i+1,j]+Poss[i,j]/2;
> 			      Poss[i+1,j+1]:=Poss[i+1,j+1]+Poss[i,j]/2;
> 			     end;
>   end;
> 
>  procedure outit;
>   var a,b:comp;
>   begin;
>    a:=Poss[N,M];
>    if a=0 then writeln('0/1')
> 	  else begin
> 		b:=a/2;
> 		while b*2=a do
> 		 begin
> 		  a:=b; b:=a/2;
> 		  Poss[0,0]:=Poss[0,0]/2;
> 		 end;
> 		writeln(a:0:0,'/',Poss[0,0]:0:0);
> 	       end;
>   end;
> 
>  begin
>   init;
>   main;
>   outit;
>  end.