#include <bits/stdc++.h>
using namespace std;
const int N = 5e5 + 5;
void sol()
{
int n, t, mx;
cin >> n >> t;
int a[N];
int ans = INT_MAX;
for(int i=1;i<=n;i++) {
cin >> a[i];
a[i] %= t;
}
sort(a + 1, a + n + 1);
mx = a[n];
for(int i=0;i<=n;i++) {
ans = min(ans, mx - a[i]);
mx = a[i] + t;
}
cout << (ans + 1) / 2 << '\n';
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(nullptr);
sol();
return 0;
}
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