#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
void solve()
{
ll n; cin>>n;
vector<pair<ll,ll>> art(n,pair<ll,ll>());
for(int i=0;i<n;i++)
cin>>art[i].first>>art[i].second;
sort(art.begin(),art.end());
ll sa=0,maxi=art[0].second;
for(int i=0;i<n;i++)
{
sa+=art[i].second;
maxi=max(maxi,((sa)-(art[i].first-art[0].first)));
}
cout<<maxi;
}
int main()
{
solve();
}
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