#include <bits/stdc++.h>   using namespace std;   int main() {     int n, m, a, b;     while (cin >> n >> m >> a >> b) {       a--;       b--;       int oa, pa, ob, pb;       oa = a / m;       pa = a % m;       ob = b / m;       pb = b % m;       if (b == n - 1) {         pb = m - 1;       }       if (oa == ob) {         cout <<  1 ;         continue;       }       if (pa == 0 && pb == m - 1) {         cout <<  1 ;         continue;       }       if (pa - pb == 1) {         cout <<  2 ;         continue;       }       int hang = ob - oa;       if (pa > 0 && pb < m - 1) {         if (hang == 1) {           cout <<  2 ;           continue;         } else {           cout <<  3 ;           continue;         }       }       cout <<  2 ;     }   }   