#include <bits/stdc++.h> using namespace std; #define ll long long #define pb push_back #define fi first #define se second int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); int n; cin >> n; vector<pair<ll, ll>> obrazy(n); for (int i = 0; i < n; i++) { cin >> obrazy[i].fi >> obrazy[i].se; } sort(obrazy.begin(), obrazy.end()); ll best = -1e18, s = 0, wyn = 0; for (int i = 0; i < n; i++) { ll wiel = obrazy[i].fi, war = obrazy[i].se; best = max(best, wiel - s); s += war; wyn = max(wyn, best + s - wiel); } cout << wyn; }