#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fs first
#define sc second
#define pb push_back
void solve() {
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 ans=(a[n-1]-a[0]+1)/2;
for(int i=0;i<n-1;i++)ans=min(ans,(a[i]+t-a[i+1]+1)/2);
cout<<ans<<'\n';
}
int main() {
#ifdef FPO
freopen("in","r",stdin);
freopen("out","w",stdout);
#endif
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
solve();
}
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