#include <bits/stdc++.h>
#define fast cin.tie(0)->sync_with_stdio(0);
#define int long long
#define inf ((int)1e18)
using namespace std;
void solve(){
int n,t;
cin >> n >> t;
int a[n];
for(int i = 0; i < n; i++){
cin >> a[i];
}
int x = a[0] % t;
int y = a[1] % t;
int fark = abs(x - y);
if(x == 0 || y == 0){
int g = min(x,y);
g += t;
fark = min(abs(x-y) , abs(g - max(x,y)));
}
if(fark % 2 == 1)cout << fark;
else cout << fark/2;
}
int32_t main(){
fast
int x = 1;
//cin >> x;
while(x--){
solve();
cout << endl;
}
}
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