#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define MOD 998244353
void solve()
{
ll n, t;
cin >> n >> t;
vector<ll> a(n);
for (int i = 0; i < n; i++)
{
cin >> a[i];
a[i] %= t;
}
sort(a.begin(), a.end());
ll mx = (t - a[n - 1] + a[0]) / 2;
for (int i = 1; i < n; i++)
{
mx = max(mx, (a[i] - a[i - 1]) / 2);
}
cout << mx << '\n';
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int tests = 1;
// cin >> tests;
for (int i = 1; i <= tests; i++)
solve();
}
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