#include<bits/stdc++.h>
using namespace std;
const int N=5e5+10;
int arr[N];
vector<int> v;
int main(){
int n,t;
cin>>n >>t;
int ans=INT_MAX;
for(int i=1;i<=n;i++) cin>>arr[i];
for(int i=1;i<=n;i++) arr[i]%=t;
for(int i=1;i<=n;i++) v.push_back(arr[i]),v.push_back(arr[i]-t);
sort(v.begin(),v.end());
for(int i=0;i<n;i++){
ans=min(ans,v[i+n-1]-v[i]);
}
cout<<(int)(ceil((double)ans/2));
}
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