#include <bits/stdc++.h> using namespace std; #define endl '\n' #define int int_fast32_t #define ul uint_fast32_t #define ll int_fast64_t #define dll long double #define ull uint_fast64_t #define spektar this_thread::sleep_for(chrono::milliseconds(50)) void solve(){ int n; cin >> n; vector<array<ll,2>> k(n); for(auto& [a,b]:k) cin >> a >> b; sort(k.begin(),k.end()); vector<ll> pref(n+1); pref[0]=-k[0][0]; ll min1=1000000000000000000; ll s=0; ll max1=0; for(int i=0; i<n; i++){ s+=k[i][1]; max1=max(max1,s-k[i][0]-min1); if(i<n-1){ pref[i]=s-k[i+1][0]; min1=min(min1,pref[i]); } } cout << max1 << endl; } signed main(){ //freopen("input.txt","r",stdin); //freopen("output.txt","w",stdout); ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); int t=1; //cin >> t; while(t--){ solve(); } }