#include <bits/stdc++.h> using namespace std; #define ll long long int main() { ios::sync_with_stdio(false); cin.tie(nullptr); int n; cin >> n; pair<ll, ll> p[n + 1]; for (int i = 1; i <= n; i++) { cin >> p[i].first >> p[i].second; } sort(p + 1, p + n + 1); ll ans = 0; for (int i = 1; i <= n; i++) { ll sm = 0; for (int j = i; j <= n; j++) { sm += p[j].second; ans = max(ans, sm - p[j].first + p[i].first); } } cout << ans; }