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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*/
#include <iostream>
#include <complex>
#include <vector>
#include <string>
#include <algorithm>
#include <cstdio>
#include <numeric>
#include <cstring>
#include <ctime>
#include <cstdlib>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <list>
#include <cmath>
#include <bitset>
#include <cassert>
#include <queue>
#include <stack>
#include <deque>
#include <random>
#include <chrono>
using namespace std;
template<class T1, class T2> inline int chkmin(T1 &x, const T2 &y) {
if (x > y) {
x = y;
return 1;
}
else {
return 0;
}
}
template<class T1, class T2> inline int chkmax(T1 &x, const T2 &y) {
if (x < y) {
x = y;
return 1;
}
else {
return 0;
}
}
#define all(c) (c).begin(), (c).end()
#define sz(c) (int)(c).size()
#define mp make_pair
#define pb push_back
#define read(FILENAME) freopen((string(FILENAME) + ".in").c_str(), "r", stdin)
#define write(FILENAME) freopen((string(FILENAME) + ".out").c_str(), "w", stdout);
template<class iterator> void output(iterator begin, iterator end, ostream &out = cerr) {
while (begin != end) {
out << (*begin) << " ";
begin++;
}
out << endl;
}
template<class T> void output(const T &x, ostream &out = cerr) {
output(x.begin(), x.end(), out);
}
void fast_io() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
}
const int MAXN = 500228;
int n;
long long a[MAXN], b[MAXN];
int main() {
fast_io();
//read("input");
cin >> n;
vector<pair<long long, int> > st;
for (int i = 0; i < n; i++) {
cin >> a[i] >> b[i];
st.pb({a[i], i});
}
sort(all(st));
long long sum = 0;
long long ans = -1e18;
long long kek = -1e18;
for (int i = 0; i < n; i++) {
chkmax(kek, st[i].first - sum);
// cout << b[st[i].second] << endl;
chkmax(ans, sum + b[st[i].second] - st[i].first + kek);
sum += b[st[i].second];
}
cout << ans << endl;
return 0;
}
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