#include <bits/stdc++.h>
using namespace std;
#define int long long
#define all(x) x.begin(), x.end()
#define pb push_back
#define nl '\n'
signed main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int n; cin >> n;
vector<pair<int, int>> v(n);
for(auto &[a, b] : v) cin >> a >> b;
sort(all(v));
int ans = 0;
for(int i = 0; i < n; i++) {
int cost = 0;
for(int j = i; j >= 0; j--) {
cost += v[j].second;
ans = max(ans, cost - (v[i].first - v[j].first));
}
}
cout << ans << nl;
}
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