R

#include<iostream>
using namespace std;
#define ll long long
void solve() {
    ll n;
    cin >> n;
    ll a1, a2, b1, b2, t1, t2;
    cin >> a1 >> a2 >> b1 >> b2 >> t1 >> t2;
    int flag = 0;

    if ((b1 < a1 && t1 < a1) || (b1 > a1 && t1 > a1)) {

        if ((b2 < a2 && t2 < a2) || (b2 > a2 && t2 > a2))
            flag = 1;
    }

    if (flag)
        cout << "YES" << endl;
    else
        cout << "NO" << endl;
}

int main() {
    solve();
    return 0;
}