#!/usr/local/bin/node

//
// See ../README.md
//

//
// Run as: node ch-2.js < input-file
//

//
// See https://stackoverflow.com/questions/2049582/
//

//
// This determines on which side of the line through (x1, y1) and
// (x2, y2) the origin lies. If > 0, then the origin lies to the left
// of the line, if < 0, the origin lies to the right of the line, if
// = 0, the origin lies on the line.
//
function side (x1, y1, x2, y2) {
    return (y2 - y1) * x2 - (x2 - x1) * y2
}


require ('readline')
. createInterface ({input: process . stdin})   
. on ('line', _ => {
    //
    // Parse input
    //
    let [x1, y1, x2, y2, x3, y3] = _ . split (/\s+/)

    //
    // Determine where the origin is relative to the three lines 
    // through the vertices of the triangle. Note we have to go
    // in a specific order through the points. (Either clock wise,
    // or counter clockwise, as long as we're consistent).
    //
    let s1 = side (x2, y2, x3, y3)
    let s2 = side (x3, y3, x1, y1)
    let s3 = side (x1, y1, x2, y2)

    //
    // If the origin either lies to the left (or on) each of the
    // lines, or to the right (or on) each of the lines, the origin
    // lies inside the triangle. If not, it does not.
    //
    console . log ((s1 <= 0 && s2 <= 0 && s3 <= 0) ||
                   (s1 >= 0 && s2 >= 0 && s3 >= 0) ? 1 : 0)
});