program flappybird;
Uses Math;
const Maxx =100000;
var N, i : Longint;
    A, B :  int64;
    inizio, fine :int64;
    uscita:boolean;
begin
	(*assign(input,  'input.txt');  reset(input);
    assign(output, 'output.txt'); rewrite(output);*)	
	readln(N);
	readln(A,B);
	inizio:=A; fine:=B; uscita:=true;
	for i:=1 to  N-1   do
	           begin
	              readln(A,B); writeln (A,B);
                  if ((A>fine) or (B<inizio))  then begin uscita:=false; writeln ('NO'); exit; end;
	              inizio:=Max (inizio, A);  
	              fine:=Min (fine,B);
	           end;
	if uscita=true then writeln('YES') ;         
end.

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