#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e6;
pair <long long int, long long int> a[maxn];
int main()
{
	int n;
	cin >> n;
	for (int i = 1;i <= n;i++)
	{
		cin >> a[i].first >> a[i].second;
	}
	sort(a + 1, a + 1 + n);
	long long int ans = a[n].second, mx = a[n].second;
	for (int i = n - 1;i;i--)
	{
		mx = max(mx - a[i + 1].first + a[i].first + a[i].second, a[i].second);
		ans = max(mx, ans);
	}
	cout << ans;
}
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