#include <iostream>
#include <climits>
#include <cmath>

using namespace std;

int px, py, kx, ky, zbir_min = INT_MAX - 1;

void trans(int &x, int &y)
{
    int tx = x, ty = y;
    x = tx - 1 - ((2*tx) % 31);
    y = ty + 1 + ((2*tx) % 31);
}

void compute(int xi, int yi, int n_trans)
{
    int mod = n_trans, mod_x = xi, mod_y = yi, raz = 0;
    int zbir2 = 0, tx, ty, zbir_temp = 0;
    int x1, y1, x2, y2;

    for(int i = 0; i < n_trans; i++)
        trans(mod_x, mod_y);

     while(true)
    {
        x1 = mod_x - 1 - ((2*mod_x) % 31);
        y1 = mod_y + 1 + ((2*mod_x) % 31);

        zbir2 = mod;
        x2 = mod_x;
        y2 = mod_y;

        while(x2 > kx)
        {
            if(abs(kx - x2) < 31)
            {
                raz = abs(kx - x2);
                tx = x2;
                ty = y2;
                zbir_temp = zbir2;
            }
            trans(x2, y2);
            zbir2++;
        }
        zbir2 += abs(kx - x2);
        if(zbir2 < zbir_min)
            zbir_min = zbir2;

        x2 = tx + raz;
        y2 = tx - raz;
        zbir2 = zbir_temp;
        zbir2 += raz;

        while(x2 > kx)
        {
            trans(x2, y2);
            zbir2++;
        }
        zbir2 += abs(kx - x2);
        if(zbir2 < zbir_min)
            zbir_min = zbir2;


        if(abs(x1 - mod_x ) >= 31)
            break;

        mod_x++;
        mod_y--;
        mod++;
    }
}

int main()
{
    cin >> px >> py;
    cin >> kx >> ky;

    if((abs(px - kx) != abs(py - ky)) || (px < kx && py < ky ) || (px > kx && py > ky))
    {
        cout << -1 << endl;
        return(0);
    }

    if(px < kx)
    {
        cout << abs(px - kx) << endl;
        return(0);
    }

    compute(px, py, 0);
    compute(px, py, 1);

    int zbir1 = 0;
    while(px > kx)
    {
        trans(px, py);
        zbir1++;
    }
    zbir1 += abs(kx - px);

    cout << min(zbir1, zbir_min) << endl;

    return(0);
}