#define _USE_MATH_DEFINES
#include<stdio.h>
#include<iostream>
#include<vector>
#include<cmath>
#include<algorithm>
#include<memory.h>
#include<map>
#include<set>
#include<queue>
#include<list>
#include<sstream>
#include<cstring>
#include<numeric>
#include<limits.h>
using namespace std;


struct point {
private: double x, y;
public:
    point() : x(0), y(0) {}
    point(double x, double y) : x(x), y(y) {}

    void scan() {
        scanf("%lf%lf", &x, &y);
    }
    point operator+ (const point & P) const {
        return point(x + P.x, y + P.y);
    }

    point operator- (const point & P) const {
        return point(x - P.x, y - P.y);
    }

    point operator/ (double k) const {
        return point(x / k, y / k);
    }

    double operator*(const point & p) const {
        return x * p.y - y * p.x;
    }

};

double triangleArea(point & A, point & B, point & C) {
    return abs((A - B) * (C - B)) * 0.5;
}


double triangleArea(point & A, point & B, point & C) {
    return abs((A - B) * (C - B)) * 0.5;
}


point f[3];
point s[3];

int main(){
    for (int i = 0; i < 3; i++) {
        f[i].scan();
    }

    for (int i = 0; i < 3; i++) {
        s[i].scan();
    }

    double fs = triangleArea(f[0], f[1], f[2]);
    double ss = triangleArea(s[0], s[1], s[2]);

    if (fs != ss) {
        printf("5");
        return 0;
    }

    return 0;
}