#include <bits/stdc++.h>
// cut here
#ifdef _MSC_VER
#include <intrin.h>
#endif
namespace atcoder {
namespace internal {
int ceil_pow2(int n) {
int x = 0;
while ((1U << x) < (unsigned int)(n)) x++;
return x;
}
int bsf(unsigned int n) {
#ifdef _MSC_VER
unsigned long index;
_BitScanForward(&index, n);
return index;
#else
return __builtin_ctz(n);
#endif
}
} // namespace internal
} // namespace atcoder
namespace atcoder {
template <class S, S (*op)(S, S), S (*e)()> struct segtree {
public:
segtree() : segtree(0) {}
segtree(int n) : segtree(std::vector<S>(n, e())) {}
segtree(const std::vector<S>& v) : _n(int(v.size())) {
log = internal::ceil_pow2(_n);
size = 1 << log;
d = std::vector<S>(2 * size, e());
for (int i = 0; i < _n; i++) d[size + i] = v[i];
for (int i = size - 1; i >= 1; i--) {
update(i);
}
}
void set(int p, S x) {
assert(0 <= p && p < _n);
p += size;
d[p] = x;
for (int i = 1; i <= log; i++) update(p >> i);
}
S get(int p) {
assert(0 <= p && p < _n);
return d[p + size];
}
S prod(int l, int r) {
assert(0 <= l && l <= r && r <= _n);
S sml = e(), smr = e();
l += size;
r += size;
while (l < r) {
if (l & 1) sml = op(sml, d[l++]);
if (r & 1) smr = op(d[--r], smr);
l >>= 1;
r >>= 1;
}
return op(sml, smr);
}
S all_prod() { return d[1]; }
template <bool (*f)(S)> int max_right(int l) {
return max_right(l, [](S x) { return f(x); });
}
template <class F> int max_right(int l, F f) {
assert(0 <= l && l <= _n);
assert(f(e()));
if (l == _n) return _n;
l += size;
S sm = e();
do {
while (l % 2 == 0) l >>= 1;
if (!f(op(sm, d[l]))) {
while (l < size) {
l = (2 * l);
if (f(op(sm, d[l]))) {
sm = op(sm, d[l]);
l++;
}
}
return l - size;
}
sm = op(sm, d[l]);
l++;
} while ((l & -l) != l);
return _n;
}
template <bool (*f)(S)> int min_left(int r) {
return min_left(r, [](S x) { return f(x); });
}
template <class F> int min_left(int r, F f) {
assert(0 <= r && r <= _n);
assert(f(e()));
if (r == 0) return 0;
r += size;
S sm = e();
do {
r--;
while (r > 1 && (r % 2)) r >>= 1;
if (!f(op(d[r], sm))) {
while (r < size) {
r = (2 * r + 1);
if (f(op(d[r], sm))) {
sm = op(d[r], sm);
r--;
}
}
return r + 1 - size;
}
sm = op(d[r], sm);
} while ((r & -r) != r);
return 0;
}
private:
int _n, size, log;
std::vector<S> d;
void update(int k) { d[k] = op(d[2 * k], d[2 * k + 1]); }
};
} // namespace atcoder
// cut here
#define int ll
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _3p5IrEq ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
using pii=pair<int,int>;
using vi=vector<int>;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}
#define all(a) a.begin(), a.end()
int op(int l,int r){
return l+r;
}
int e(){
return 0;
}
void slv(){
int n;
cin>>n;
vec(pii) a(n);
rep(i,n){
cin>>a[i].fi>>a[i].se;
}
vi tmp;
rep(i,n){
tmp.pb(a[i].fi),tmp.pb(a[i].se);
}
sort(all(tmp));
tmp.erase(unique(all(tmp)),tmp.end());
const int si=sz(tmp);
rep(i,n){
a[i].fi=lower_bound(all(tmp),a[i].fi)-tmp.begin();
a[i].se=lower_bound(all(tmp),a[i].se)-tmp.begin();
}
int ans=0;
atcoder::segtree<int,op,e> seg(si);
auto rec=[&](auto self,int l,int r,vec(pii) a)->void{
if(l>=r-1){
return;
}
int n=sz(a);
int m=(l+r)/2;
vec(pii) up,lo;
rep(i,n){
if(a[i].se>=m){
up.pb(a[i]);
}else{
lo.pb(a[i]);
}
}
sort(all(up)),reverse(all(up));
sort(all(lo)),reverse(all(lo));
set<pii> stup,stlo;
int i=0,j=0;
while(i<sz(up) or j<sz(lo)){
int typ=0;
if(j==sz(lo)){
typ=1;
}else if(i==sz(up)){
typ=0;
}else if(up[i].fi>lo[j].fi){
typ=1;
}
if(typ){
pii p=up[i];
while(sz(stup)){
auto it=prev(stup.end());
pii q=*it;
if(p.se<q.fi){
seg.set(q.se,seg.get(q.se)-1);
stup.erase(it);
}else{
break;
}
}
seg.set(p.fi,seg.get(p.fi)+1);
stup.insert({p.se,p.fi});
i+=1;
}else{
int to=si;
pii p=lo[j];
for(auto q:stlo){
if(q.se>p.se){
to=min(to,q.fi);
}
}
ans+=seg.prod(p.fi,to);
stlo.insert(p);
j+=1;
}
}
for(auto p:up){
seg.set(p.fi,0);
}
self(self,l,m,lo);
self(self,m,r,up);
};
rec(rec,0,si,a);
print(ans);
}
signed main(){
_3p5IrEq;
slv();
}
