This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
/*
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╚██╗░██╔╝██╔══██╗██║░░░██║██╔════╝██╔════╝██╔════╝██╔════╝
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░░╚██╔╝░░██║░░██║██║░░░██║░╚═══██╗░╚═══██╗██╔══╝░░██╔══╝░░
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░░░╚═╝░░░░╚════╝░░╚═════╝░╚═════╝░╚═════╝░╚══════╝╚═╝░░░░░
*/
#include <bits/stdc++.h>
using namespace std;
#define nl "\n"
#define ll long long
#define fi first
#define se second
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
int main() {
fast
int n;
cin>>n;
vector<pair<ll,ll>>art;
for(int i=0;i<n;i++)
{ll siz,va;
cin>>siz>>va;
art.push_back({siz,va});
}
sort(art.begin(),art.end());
for(int i=1;i<n;i++)
{
art[i].se+=art[i-1].se;
}
ll ma=-1;
for(int i=0;i<n;i++)
{
for(int j=i;j<n;j++)
{
if(i!=0)
ma=max(ma,(art[j].se-art[i-1].se)-(art[j].fi-art[i].fi));
else
ma=max(ma,(art[j].se)-(art[j].fi-art[i].fi));
}
}
cout<<ma;
return 0;
}
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