// UUID: 061c1776-5333-4b53-9baa-82f16ef115d8
#include <bits/stdc++.h>
using namespace std;
int main() {
int n, k;
cin >> n >> k;
vector<int> alap(n);
for(int &x : alap){
cin >> x;
x %= k;
}
sort(alap.begin(), alap.end());
int legN = alap.back();
int mini = alap.back() - alap[0];
for(int i = 0; i < n; i++){
int akt = legN - alap[i];
mini = min(mini, akt);
legN = alap[i] + k;
}
cout << (mini + 1) / 2 << "\n";
}
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