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//
// See ../README.md
//
//
// Run as: ln ch-2.java ch2.java; javac ch2.java; java ch2 < input-file
//
import java.util.*;
public class ch2 {
static int dist (int x1, int y1, int x2, int y2) {
return (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);
}
public static void main (String [] args) {
Scanner scanner = new Scanner (System . in);
while (scanner . hasNext ()) {
int x1 = scanner . nextInt ();
int y1 = scanner . nextInt ();
int x2 = scanner . nextInt ();
int y2 = scanner . nextInt ();
int x3 = scanner . nextInt ();
int y3 = scanner . nextInt ();
int x4 = scanner . nextInt ();
int y4 = scanner . nextInt ();
System . out . println (
dist (x1, y1, x2, y2) == dist (x2, y2, x3, y3) &&
dist (x2, y2, x3, y3) == dist (x3, y3, x4, y4) &&
dist (x3, y3, x4, y4) == dist (x4, y4, x1, y1) &&
dist (x1, y1, x3, y3) == dist (x2, y2, x4, y4) ? 1 : 0);
}
}
}
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