//william889
# include<bits/stdc++.h>
using namespace std;
int main(){
	int n,t;
	cin>>n>>t;
	int a[n];
	for(int i=0;i<n;i++){
		cin>>a[i];
		a[i]%=t;
	}
	sort(a,a+n);
	int minx=(a[n-1]-a[0]+1)/2;
	for(int i=0;i<n-1;i++){
		minx=min(minx,(a[i]+t-a[i+1]+1)/2);
	}
	cout<<minx;
}
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