#include<bits/stdc++.h>
#define int long long
using namespace std;
signed main(){
ios::sync_with_stdio(false);cin.tie(0);
int n,t;cin>>n>>t;
vector<int> a(n);
for(int &i:a)cin>>i;
int ans = 2e9;
for(int T = 0 ; T <= 3000; T++){
int maxI = 0;
for(int j = 0 ; j < n ; j++){
if(T-a[j]>=0)maxI = max(maxI, T-a[j]);
else maxI = max(maxI, (-(T-a[j]))%t);
}
ans = min(ans, maxI);
}
cout << ans << endl;
}
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