#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 998244353
ll i, n, a, A;
pair<ll, ll> p[500005];
void solve()
{
cin >> n;
for (i = 1; i <= n; i++)
cin >> p[i].first >> p[i].second;
sort(p + 1, p + n + 1);
for (i = 1; i <= n; i++)
A = max(A, a + p[i].second),
a += p[i].first + p[i].second - p[i + 1].first, a *= (a > 0);
cout << A;
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
ll t = 1;
// cin >> t;
for (int i = 1; i <= t; i++)
{
solve();
}
}
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