#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
#include <algorithm>
#include <set>
#include <queue>
#include <map>
#include <stack>
#include <bitset>
#include <string>
#include <cstring>
#include <iterator>
#include <random>
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;
typedef long double ld;
const ll dim = 5*1e6+7;
//const ll mod = 1e9 + 7;
const ll inf = 1e18 + 77;
#define endl "\n"
#define fi first
#define pb push_back
#define se second
#define vll vector<ll>
ll n, m;
pll a[dim];
ll pr[dim];
int main() {
ll k;
cin>>n;
for(int i=1; i<=n; i++){
cin>>a[i].fi>>a[i].se;
}
sort(a+1, a+1+n);
ll ans=0;
ll y=0;
ll curs=0;
for(int i=1; i<=n; i++){
y=max(a[i].fi-curs,y );
curs+=a[i].se;
ll val=curs-a[i].fi+y;
ans=max(ans, val);
}
cout<<ans<<endl;
return 0;
}
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