#include <bits/stdc++.h>
using namespace std;
// #define int long long
#define sp << ' ' <<
#define nl << '\n'
const int INF = 2e9;
struct SegmentTree{
vector<int> a; int sz = 1;
SegmentTree(int n){
while(sz < n) sz += sz;
a.assign(2*sz, -INF);
}
void update(int i, int v, int x, int lx, int rx){
if(rx-lx==1) return void(a[x] = v);
int mx = (lx + rx) / 2;
if(i < mx) update(i, v, 2*x+1, lx, mx);
else update(i, v, 2*x+2, mx, rx);
a[x] = max(a[2*x+1], a[2*x+2]);
}
void update(int i, int v){ update(i, v, 0, 0, sz); }
int firstGreater(int v, int x, int lx, int rx){
if(rx-lx==1) return lx;
int mx = (lx + rx) / 2;
if(a[2*x+1] > v) return firstGreater(v, 2*x+1, lx, mx);
else return firstGreater(v, 2*x+2, mx, rx);
}
int firstGreater(int v){ return firstGreater(v, 0, 0, sz); }
};
signed main(){
cin.tie(0)->sync_with_stdio(0);
int n; cin >> n;
int l[n], r[n];
for(int i=0; i<n; ++i) cin >> l[i] >> r[i];
SegmentTree a(n+1), b(n+1);
for(int i=n-1; i>=0; --i){
int j = min(a.firstGreater(l[i]), b.firstGreater(-l[i]));
j = min(j, n);
a.update(i, l[i]);
b.update(i, -r[i]);
r[i] = j - i;
if(j < n && l[i] < l[j]) r[i] += r[j];
}
cout << *max_element(r, r+n);
}
