program flappybird;
const Max =100000;
var N, i : Longint;
    A, B : array[0..MAX] 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]>=inizio ) and (A[i]<=fine) then begin inizio:=A[i]; if B[i]<=fine then fine:=B[i]; end
	                                                  else if A[i]>fine then begin uscita:=false; writeln ('NO'); exit; end
	                                                  else if A[i]<inizio then begin if B[i]<inizio then begin uscita:=false; writeln ('NO'); exit; end  
	                                                                                                else if (B[i]>=inizio) and (B[i]<=fine) then fine:=B[i]; 
	                                                                           end;                                                                                                                                                                              
 
	          end;
	if uscita=true then writeln('YES') ;         
end.

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

MgoxIDUKMCA0

2
1 5
0 4