#include <bits/stdc++.h>
using namespace std;
#define int long long
#define debug(x) cerr<<#x<<" is "<<x<<endl;
signed main(){
ios_base::sync_with_stdio(0);cin.tie(0);
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 m=a[0]+n-a[n-1];
for(int i=1;i<n;i++){
m=max(m,a[i]-a[i-1]);
}
//debug(m)
cout<<(t-m+1)/2<<'\n';
}
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