#include <bits/stdc++.h> using namespace std; const int MAX = 2e5 + 10, MOD = 1e7 + 7; int dp[MAX], dp2[MAX]; void solve() { vector<pair<int, int>> vt; map<int, int> mp; int n; cin >> n; int a[n + 1]; int b[n + 1]; for(int i = 1; i <= n; i++) { cin >> a[i] >> b[i]; vt.push_back({a[i], b[i]}); } sort(vt.begin(), vt.end()); int pref[n + 1]; pref[0] = 0; for(int i = 0; i < n; i++) { pref[i + 1] = pref[i] + vt[i].second; mp[vt[i].first] = i; } sort(a + 1, a + n + 1); int ans = 0; for(int i = 1; i <= n; i++) { for(int j = i; j <= n; j++) { int x = mp[a[j]], y = mp[a[i]]; ans = max(ans, pref[x + 1] - pref[y] - (a[j] - a[i])); } } cout << ans << endl; } signed main() { int t = 1; //cin >> t; while(t--) { solve(); } }