program flappybird;
const Max =100000;
var N, i : Longint;
    A, B : array[0..MAX] of int64;
    inizio, fine :int64;
    uscita:boolean;
begin
	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 begin 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;                                                  
	          end;
	if uscita=true then writeln('YES') ;         
end.

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