#include <bits/stdc++.h>   int main() {     int n, m, a, b, t;     while (scanf( %d%d%d%d , &n, &m, &a, &b) != EOF) {       if (b == n) b = (n - 1) / m * m + m;       a--;       b--;       if (a > b)         while (1)           ;       if (a / m == b / m || m == 1)         t = 1;       else if (a % m == 0) {         if (b % m == m - 1)           t = 1;         else           t = 2;       } else {         if (b / m - a / m == 1)           t = 2;         else if (b % m == m - 1)           t = 2;         else if ((b - a + 1) % m == 0)           t = 2;         else           t = 3;       }       printf( %d n , t);     }     return 0;   }   