#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main(){
ios::sync_with_stdio(false);cin.tie(0);
int n,t;cin>>n>>t;
vector<int> a(n);
for(int &i:a){cin>>i;i%=t;}
vector<int> pa;
for(int i = 0 ; i < n ; i++){
pa.push_back(a[i]);
pa.push_back(a[i]-t);
}
sort(pa.begin(), pa.end());
int ans = 1e18;
for(int i = 0 ; i < n ; i++){
ans = min(ans, pa[n-1+i]-pa[i]);
}
cout << (ans+1)/2 << endl;
}
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