// Source: https://usaco.guide/general/io
#include <bits/stdc++.h>
#define int long long
using namespace std;
int32_t main() {
int n, t;
cin >> n >> t;
vector <int> arr(n);
for(int i = 0; i < n; i++) {
cin >> arr[i];
arr[i] %= t;
}
sort(arr.begin(), arr.end());
cout << min(arr[1] - arr[0], arr[0] - arr[1] + t);
}
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