#include <bits/stdc++.h> #define pb push_back #define f first #define sc second using namespace std; typedef long long int ll; typedef string str; int main(){ ios_base::sync_with_stdio(0); cin.tie(0); int n; cin >> n; ll ans = 0, mx = 0; vector<pair<ll, ll>> v(n); for(auto &p: v) cin >> p.f >> p.sc, ans = max(ans, p.sc); sort(v.begin(), v.end()); for(int i = 1; i < n; i++){ ll x = v[i-1].sc-(v[i].f-v[i-1].f); mx = max(mx+x, x); ans = max(ans, mx+v[i].sc); } cout << ans << "\n"; }