#include <bits/stdc++.h>
using namespace std;
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int n, t;
cin >> n >> t;
vector<int> a(n);
for (int &x : a)
{
cin >> x;
x %= t;
}
sort(begin(a), end(a));
if (a[0] == a[n - 1])
{
cout << 0 << endl;
return 0;
}
int ans = a[0] + t - a[n - 1];
for (int i = 0; i + 1 < n; i++)
ans = max(ans, a[i + 1] - a[i]);
cout << (t - ans + 1) / 2 << endl;
}
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