#include <bits/stdc++.h>
#define int long long
using namespace std;
int32_t main(){
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int n;
cin>>n;
vector<pair<int,int>> deg(n);
for(int i=0;i<n;i++) cin>>deg[i].first>>deg[i].second;
sort(deg.begin(), deg.end());
vector<int> pref(n);
pref[0]=deg[0].second;
for(int i=1;i<n;i++) pref[i]=deg[i].second+pref[i-1];
int cevap=0;
int toplam;
for(int i=0;i<n;i++){
for(int j=i; j<n; j++){
if(i==0) toplam=pref[j];
else toplam=pref[j]-pref[i-1];
int fark=deg[j].first-deg[i].first;
cevap=max(cevap,toplam-fark);
}
}
cout<<cevap;
}
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