import std.algorithm, std.array, std.container, std.range, std.bitmanip;
import std.numeric, std.math, std.bigint, std.random, core.bitop;
import std.string, std.regex, std.conv, std.stdio, std.typecons;

void main()
{
  auto pi = iota(5)
    .map!(_ => readln.split.map!(to!int))
    .map!(rd => point(rd[0], rd[1])).array;

  auto r = false;
  foreach (qi; pi.permutations)
    if (calc(qi.array)) {
      writeln("YES");
      return;
    }

  writeln("NO");
}

bool calc(point[] pi)
{
  auto n = pi.length;
  foreach (i; 0..n) {
    foreach (j; 1..n-1)
      if (cross(pi[j] - pi[0], pi[j + 1] - pi[0]) <= 0)
        return false;
    pi = pi[1..$] ~ pi[0];
  }
  return true;
}

int cross(point p1, point p2)
{
  return p1.x * p2.y - p1.y * p2.x;
}

struct Point(T) {
  T x, y;

  point opBinary(string op)(point rhs) {
    static if (op == "+") return point(x + rhs.x, y + rhs.y);
    else static if (op == "-") return point(x - rhs.x, y - rhs.y);
  }
}

alias Point!int point;