#include <iostream>
#include <algorithm>
using namespace std;
#define int long long
signed main()
{
int n,t;
cin>>n>>t;
int a[500005];
for(int i=1; i<=n; i++){
cin>>a[i];
a[i] %= t;
}
sort(a+1, a+n+1);
int ans = a[n] - a[1];
for(int i=1; i<n; i++){
ans = min(ans, a[i] + t - a[i+1]);
}
cout<<(ans+1)/2<<endl;
return 0;
}
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