program Project2;

{$APPTYPE CONSOLE}

function ml(a,b,a1,b1:integer):boolean;
var p:boolean;
begin
p:=false;
  if ((a>=a1)and(b>=b1))or((a>=b1)and(b>=a1)) then p:=true else
    if ((a<=a1)and(b<=b1))or((a<=b1)and(b<=a1)) then p:=true else
      p:=false;
ml:=p;
end;

var a,b:array[1..200000]of integer;
    i,j,n,k:integer;
begin
assign(Input,'task.in');
reset(Input);
readln(n);
for i:=1 to n do readln(a[i],b[i]);
close(Input);


k:=0;
for i:=1 to n do
  for j:=i to n do
    if (i<>j)and(ml(a[i],b[i],a[j],b[j])) then inc(k);

assign(Output,'task.out');
rewrite(Output);
writeln(k);
close(Output);
end.