using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = int.Parse(line[0]);
        var b = int.Parse(line[1]);
        var c = int.Parse(line[2]);
        var d = int.Parse(line[3]);
        getAns(a, b, c, d);
    }
    static void getAns(int a, int b, int c, int d)
    {
        var end = b + 31;
        int ans;
        if (a + c <= end) ans = 1;
        else if (a + d <= end) ans = 2;
        else ans = 3;
        Console.WriteLine(ans);
    }
}