横纵坐标差值的绝对值相加即可

import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int w = sc.nextInt(), n = sc.nextInt(), m = sc.nextInt();

        int row1 = getX(w, n), row2 = getX(w, m);
        int col1 = getY(w, n), col2 = getY(w, m);

        //相差为2的倍数时不用管，否则随便调整某一个的列值即可
        if (row1 % 2 != row2 % 2)
            col1 = w - col1 + 1;

        int ans = Math.abs(row1 - row2) + Math.abs(col1 - col2);

        System.out.println(ans);
    }
    static int getY(int w, int u) {
        return (u - 1) % w + 1;
    }

    static int getX(int w, int u) {
        return (u - 1) / w + 1;
    }
}