#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define pi pair
const int N=5e5+10;
pair<ll,ll> a[N];
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;
cin>>n;
for(int i=1;i<=n;i++)
{
cin>>a[i].fi>>a[i].se;
}
sort(a+1,a+n+1);
ll ma=LLONG_MIN;
ll be=LLONG_MIN;
ll sum=0;
for(int i=1;i<=n;i++)
{
ma=max(ma,a[i].fi-sum);
sum+=a[i].se;
be=max(be,sum-a[i].fi+ma);
}
cout<<be;
}
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