#include <iostream>
int main() {
int n;
int kx, ky;
int qx, qy;
int tx, ty;
std::cin >> n;
std::cin >> qx >> qy;
std::cin >> kx >> ky;
std::cin >> tx >> ty;
if(
(kx < qx && qx < tx) ||
(ky < qy && qy < ty) ||
(tx < qx && qx < kx) ||
(ty < qy && qy < ky)
)
std::cout << "NO" << std::endl;
else
std::cout << "YES" << std::endl;
return 0;
}
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