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)  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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

MwozIDYKNCA3CjUgNg==

3
3 6
4 7
5 6