#include <bits/stdc++.h>
#define int long long
using namespace std;
int32_t main() {
int n; cin>>n;
vector<pair<int,int>> a(n);
for(int i=0; i<n; i++) cin>>a[i].first>>a[i].second;
sort(a.begin(),a.end());
vector<int> pre(n+1,0);
for(int i=0; i<n; i++) pre[i+1]=pre[i]+a[i].second;
int ans=LLONG_MIN,mn=LLONG_MAX;
for(int i=0; i<n; i++) {
mn=min(mn,pre[i]-a[i].first);
ans=max(ans,pre[i+1]-a[i].first-mn);
}
cout<<ans;
return 0;
}
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