Program zad5b;
  var n,i,j,x,m:integer;
  a,b:array[1..20] of integer;
  flag:boolean;
Begin
  read(n);
  for i:=1 to n do
    read(a[i]);
  for i:=1 to n do
    if i mod 2=0 then
    begin
      m:=m+1;
      b[m]:=a[i];
    end;
  x:=b[1];
  if m=1 then writeln('jeste rastuci') else
  begin
  for i:=2 to m do
  begin
  flag:=true;
    if b[i]>x then x:=a[i] else
    begin
      flag:=false;
      break;
    end;
  end;
  if flag=true then writeln('jeste rastuci') else writeln('nije');
  end;
End.
  