#include <bits/stdc++.h>
using namespace std;
#define int long long
int32_t main(){
int n, k;
std::cin >> n >> k;
std::vector <int> arr(n);
for(int i=0; i<n; i++){
std::cin >> arr[i];
arr[i]%=k;
}
sort(arr.begin(), arr.end());
arr.push_back(arr[0]);
int ans=LLONG_MAX;
for(int i=0; i<n; i++){
int mn=(arr[i]+k-arr[i+1]);
ans=min(ans, mn);
}
std::cout << (ans+1)/2;
}
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