// created : 2026/02/08 18:40:30 #include <bits/stdc++.h> using namespace std; #define int long long #define pb push_back #define all(v) v.begin(), v.end() void solve() { int n; cin >> n; vector<pair<int, int>> vt; for(int i = 0; i < n; i++) { int x, y; cin >> x >> y; vt.pb({x, y}); } sort(all(vt)); int maxi = 0; int l = 0, r = n - 1; while(l <= r) { int m = (r + l) / 2; int sum = 0, a = LLONG_MIN, b = LLONG_MAX; for(int j = 0; j < m; j++) { a = max(vt[j].first, a), b = min(vt[j].first, b); sum += vt[j].second; } if(maxi < sum - (a - b)) { maxi = sum - (a - b); l = m + 1; } else { r = m - 1; } } cout << maxi << '\n'; } signed main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); int t = 1; //cin >> t; while (t--) { solve(); } }