const
    MAXN=25;
    MAXM=25;
    dx:array[1..4] of integer=(-1,1,0,0);
    dy:array[1..4] of integer=(0,0,-1,1);
var
    map:array[0..MAXN+1,0..MAXM+1] of char;
    d:array[1..MAXN,1..MAXM] of integer;
    t,m,n:integer;
    i,j:integer;
    sx,sy,ex,ey:integer;
    
procedure dfs(x,y,k:integer);
begin
    if k<d[x,y] then
        d[x,y]:=k
    else
        exit;
    if map[x-1,y]<>'o' then dfs(x-1,y,k+cost[x-1,y]);
    if map[x+1,y]<>'o' then dfs(x+1,y,k+cost[x+1,y]);
    if map[x,y-1]<>'o' then dfs(x,y-1,k+cost[x,y-1]);
    if map[x,y+1]<>'o' then dfs(x,y+1,k+cost[x,y+1]);
end;

begin
    readln(t);
    readln(m);
    readln(n);

    for i:=1 to n do begin
        for j:=1 to m do begin
            read(map[i,j]);
            if map[i,j]='s' then begin sx:=i; sy:=j; end;
            if map[i,j]='m' then begin ex:=i; ey:=j; end;
            if map[i,j]='.' then cost[i,j]:=1;
            if map[i,j]='#' then cost[i,j]:=2;
        end;
        readln;
    end;

    for i:=0 to n+1 do begin map[i,0]:='o'; map[i,m+1]:='o'; end;
    for j:=1 to m do begin map[0,j]:='o'; map[n+1,j]:='o'; end;
    
    dfs(sx,sy,0);
    writeln(d[ex,ey]);
end.