program flappybird;
Uses Math;
const Maxx =100000;
var N, i : Longint;
    A, B : array[0..MAXX] of int64;
    inizio, fine :int64;
    uscita:boolean;
begin
	(*assign(input,  'input.txt');  reset(input);
    assign(output, 'output.txt'); rewrite(output);*)	
	readln(N);
	for i:=0 to N-1 do readln(A[i],B[i]);
	inizio:=A[0]; fine:=B[0]; uscita:=true;
	for i:=1 to  N-1 do
	           begin
	              if (A[i]>fine) or (B[i]<inizio) or (inizio>fine) then begin uscita:=false; writeln ('NO'); exit; end;
	              inizio:=Max (inizio, A[i]);  
	              fine:=Min (fine,B[i]);
	           end;
	if uscita=true then writeln('YES') ;         
end.

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