#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define f first
#define s second
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
ll n;
cin >> n;
ll a[n+1],b[n+1],mx=0;
for (int i=1; i<=n; i++) cin >> a[i] >> b[i];
for (int i=1; i<=n; i++) {
for (int j=i+1; j<=n; j++) {
mx=max(mx,(b[i]+b[j])-abs(a[j]-a[i]));
}
}
cout << mx;
}
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