#include <bits/stdc++.h>
using namespace std;
#define print(l) for(auto i:l) cout<<i<<" ";cout<<endl;
#define input(t,l,n) vector<t>l(n);for(int i = 0;i<n;i++)cin>>l[i];
#define int long long
#define pb push_back
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> 
#define all(l) l.begin(),l.end()
#define pii pair<int,int>
#define fi first
#define se second
const int M = 998244853;
int inf = 1e18;
void io(){
    #ifndef ONLINE_JUDGE
    freopen("input.in","r",stdin);
    // freopen("outputf.in","w",stdout);
    #endif
    ios::sync_with_stdio(0);//DO NOT USE IN INTERACTIVE
    cin.tie(0), cout.tie(0);
    cout << fixed<<setprecision(9);
}
int n,T;
void solve(){
     cin>>n>>T;
     input(int,l,n);
     // print(l);
     int ans = 1e18;
     for(int i = 0;i<30000;i++){
        int an = -1e18;
        for(int j:l){
            if(j >= i){
                int fl = abs(j-i)/T;
                fl = j-fl*T;
                int cl = fl+T;
                // cout<<cl<<" "<<j<<" "<< i <<" "<<fl<<endl;
                an = max(an,min({abs(i-cl),abs(i-fl)}));
            }
            else{
                an = max(an,abs(i-j));
            }
            // if(j >= T)an = max(an,min(abs((j%T)-i),abs((j%T)+T-i)));
            // else if(j >= 2*T)an = max(an,min({abs((j%T)-i),abs((j%T)+T-i),abs((j%T)+T+T-i)}));
            // else if(j >= 3*T)an = max(an,min({abs((j%T)-i),abs((j%T)+T-i),abs((j%T)+T+T-i),abs((j%T)+T+T+T-i)}));
            // else if(j >= 4*T)an = max(an,min({abs((j%T)-i),abs((j%T)+T-i),abs((j%T)+T+T-i),abs((j%T)+T+T+T-i),abs((j%T)+T+T+T+T-i)}));
            // else an = max(an,abs((j%T)-i));
        }
        ans = min(ans,an);
        an = -1e18;
     }
     cout<<ans<<endl;
}
signed main(){
    // io();
    int t = 1;
    while(t--) solve();
}
Compilation message (stderr)
Main.cpp: In function 'void io()':
Main.cpp:20:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     freopen("input.in","r",stdin);
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