Program str;
type
   arr=record
           len:longint;
           d:array[1..15] of longint;
       end;
var
   n,i,j,k:longint;
   f:array[0..60,0..60,0..60] of arr;
function max(a,b:longint):longint;
begin
   if a>b then exit(a) else exit(b);
end;
procedure sum(a,b:arr;var c:arr);
var
   i,j:longint;
const
   F=100000000;

begin
   fillchar(c,sizeof(c),0);
   c.len:=max(a.len,b.len);
   for i:=1 to c.len do
   begin
      inc(c.d[i],a.d[i]+b.d[i]);
      inc(c.d[i+1],c.d[i] div F);
      c.d[i]:=c.d[i] mod F;
   end;
   if c.d[c.len+1]>0 then inc(c.len);

   while (c.len>0) and (c.d[c.len]=0) do dec(c.len);


end;
Procedure print(a:arr);
var
   i,p:longint;
begin
   write(a.d[a.len]);
   for i:=a.len-1 downto 1 do
   begin
      p:=a.d[i];
      if p<10000000 then write('0');
      if p<1000000 then write('0');
      if p<100000 then write('0');
      if p<10000 then write('0');
      if p<1000 then write('0');
      if p<100 then write('0');
      if p<10 then write('0');
      write(p);
   end;
   writeln;
end;
begin
   read(n);
   fillchar(f,sizeof(f),0);
   f[0,0,0].len:=1;
   f[0,0,0].d[1]:=1;
   for i:=1 to n do
      for j:=0 to i do
         for k:=0 to j do
         begin
            if k>0 then
            begin
               sum(f[i,j,k],f[i,j,k-1],f[i,j,k]);
            end;
            if i>j then sum(f[i,j,k],f[i-1,j,k],f[i,j,k]);
            if j>k then sum(f[i,j,k],f[i,j-1,k],f[i,j,k]);
         end;

   print(f[n,n,n]);
end.