#include <bits/stdc++.h>
using namespace std;
int main() {
int n, t, ans=1e9; cin >> n >> t;
multiset<int> st;
for(int i=1; i<=n; i++) { int x; cin >> x; st.insert(x%t); }
ans = *st.rbegin() - *st.begin();
for(int i=n; i>=1; i--) {
st.insert(*st.rbegin()-t);
st.erase( --st.end() );
ans = min(ans, *st.rbegin() - *st.begin());
}
cout << (ans + 1) / 2 << endl;
}
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