This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define ff first
#define ss second
#define endl '\n'
using namespace std;
const long long INF = (long long) 1e18;
const int mod = (int) 1e9+7;
const int MAXN = (int) 3e5+5;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
ll n;
int main(){
ios_base::sync_with_stdio(false);
cin.tie(nullptr);cout.tie(nullptr);
#ifdef Local
freopen("C:/Users/Admin/Desktop/Yazilim/C/IO/int.txt","r",stdin);
freopen("C:/Users/Admin/Desktop/Yazilim/C/IO/out.txt","w",stdout);
#endif
cin>>n;
set<pii> st;
for(int i = 0; i < n; i++){
int x, y;
cin>>x>>y;
x /= -2;
y /= 2;
auto u = st.lower_bound({x, mod});
while(u != st.end() && (*u).ss <= y)
u = st.erase(u);
if(u != st.begin() && (*prev(u)).ss >= y)
continue;
st.insert({x, y});
}
ll pos = -mod, ans = 0, heg = 0;
for(auto u = st.begin(); u != st.end(); u++){
ll ex = ((*u).ff - pos) * heg;
ans += ex;
heg = (*u).ss;
pos = (*u).ff;
}
ans += -pos*heg;
cout<<4*ans<<endl;
#ifdef Local
cout<<endl<<fixed<<setprecision(2)<<1000.0 * clock() / CLOCKS_PER_SEC<< " milliseconds ";
#endif
}
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