#include <bits/stdc++.h>
using namespace std;
signed main() {
ios::sync_with_stdio(false);
cin.tie(0);
int tt = 1;
//cin >> tt;
while (tt--) {
int n, t;
cin >> n >> t;
vector<int> a(n);
for (int i = 0;i < n;i++) {
cin >> a[i];
a[i] %= t;
}
sort(a.begin(), a.end());
int ans = a[n - 1] - a[0];
for (int i = 1;i < n;i++)
ans = min(ans, t - a[i] + a[i - 1]);
cout << (ans + 1) / 2 << '\n';
}
return 0;
}
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