#include<bits/stdc++.h>
#define int long long
using namespace std;
signed 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());
int mn=a[0].first;
int ans=0;
int sum=0;
for(int i=0;i<n;++i){
sum+=a[i].second;
ans=max(ans,sum-(a[i].first-mn));
}
cout<<ans;
}
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