This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#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;
}
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