#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define endl '\n'
void compress(vector<int> &a){
int n = a.size();
vector<pair<int,int>> b(n);
for(int i=0;i<n;i++){
b[i].first = a[i];
b[i].second = i;
}
sort(b.begin(),b.end());
a[b[0].second] = 1;
int cnt = 1;
for(int i=1;i<n;i++){
if(b[i].first == b[i-1].first){
a[b[i].second] = a[b[i-1].second];
}
else a[b[i].second] = ++cnt;
}
}
struct segTree{
int n;
vector<int> tree;
vector<pair<int,int>> lazy;
segTree(int _n){
n = _n;
tree.resize(4*n+5);
lazy.resize(4*n+5);
}
void prop(int node,int l,int r){
if(lazy[node].second) tree[node] = 0;
tree[node] += (r - l + 1) * lazy[node].first;
if(l != r){
lazy[node<<1].first += lazy[node].first;
lazy[node<<1|1].first += lazy[node].first;
lazy[node<<1].second |= lazy[node].second;
lazy[node<<1|1].second |= lazy[node].second;
}
lazy[node] = {0,0};
}
void update(int node,int l,int r,int lQ,int rQ,int val){
if(l>r) return;
if(lazy[node].first || lazy[node].second) prop(node,l,r);
if(lQ>r || l>rQ) return;
if(lQ<=l&&r<=rQ) return lazy[node].first += val, prop(node,l,r), void();
int md = l + r >> 1;
update(node<<1,l,md,lQ,rQ,val), update(node<<1|1,md+1,r,lQ,rQ,val);
tree[node] = tree[node<<1] + tree[node<<1|1];
}
void clear(){
if(lazy[1].first || lazy[1].second) prop(1,1,n);
lazy[1] = {0,1}, prop(1,1,n);
}
void update(int l,int r,int val=1){
update(1,1,n,l,r,val);
}
int query(int node,int l,int r,int lQ,int rQ){
if(l>r) return 0;
if(lazy[node].first || lazy[node].second) prop(node,l,r);
if(lQ>r || l>rQ) return 0;
if(lQ<=l&&r<=rQ) return tree[node];
int md = l + r >> 1;
return query(node<<1,l,md,lQ,rQ) + query(node<<1|1,md+1,r,lQ,rQ);
}
int query(int l,int r){
return query(1,1,n,l,r);
}
};
void solve(){
int n;
cin>>n;
vector<pair<int,int>> v(n);
for(auto &[l,r] : v) cin>>l>>r;
vector<int> tmp;
for(auto [l,r] : v) tmp.push_back(l);
for(auto [l,r] : v) tmp.push_back(r);
compress(tmp);
for(int i=0;i<n;i++) v[i] = {tmp[i],tmp[i+n]};
segTree sg(n);
int ans = 1;
for(auto [l,r] : v){
if(sg.query(l,r)) {
sg.clear();
ans ++;
}
sg.update(l,r);
}
cout<<ans<<endl;
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int t=1;
//cin>>t;
while(t--){
solve();
}
return 0;
}
