#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main()
{
int n;
cin>>n;
pair<int,int> a[n];
for (int i=0;i<n;i++)
cin>>a[i].first>>a[i].second;
sort(a,a+n);
long long ans=0, su=0, mn=-1e18;
for (int i=0;i<n;i++)
mn=max(mn,-su+a[i].first), su+=a[i].second, ans=max(ans,su-a[i].first+mn);
cout<<ans<<endl;
return 0;
}
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