def main():
    n = int(input())
    ax, ay = [int(i) for i in input().split()] # queen
    bx, by = [int(i) for i in input().split()] # king
    cx, cy = [int(i) for i in input().split()] # dest
    
    if (bx > ax and ax > cx) or (cx > ax and ax > bx):
        print("NO")
        return

    if (by > ay and ay > cy) or (cy > ay and ay > by):
        print("NO")
        return
    print("YES")

main()