#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define pb push_back
#define fi first
#define se second
#define dd(x) cout<<#x<<" is "<<x<<endl;
signed main(){
	ios::sync_with_stdio(0); cin.tie(0);
	
	int n,t; cin>>n>>t;
	int a,b; cin>>a>>b;
	int d = abs(a-b);
	int k = d%t;
	k = min(k,t-k);
	cout<<k;
	
	return 0;
}
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