#include <bits/stdc++.h>
using namespace std;
struct fast_ios { fast_ios(){ cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;
#define FOR(i, begin, end) for(int i=(begin);i<(end);i++)
#define REP(i, n) FOR(i,0,n)
#define IFOR(i, begin, end) for(int i=(end)-1;i>=(begin);i--)
#define IREP(i, n) IFOR(i,0,n)
#define Sort(v) sort(v.begin(), v.end())
#define Reverse(v) reverse(v.begin(), v.end())
#define all(v) v.begin(),v.end()
#define SZ(v) ((int)v.size())
#define Lower_bound(v, x) distance(v.begin(), lower_bound(v.begin(), v.end(), x))
#define Upper_bound(v, x) distance(v.begin(), upper_bound(v.begin(), v.end(), x))
#define Max(a, b) a = max(a, b)
#define Min(a, b) a = min(a, b)
#define bit(n) (1LL<<(n))
#define bit_exist(x, n) ((x >> n) & 1)
#define Ans(f, y, n) if(f) cout << y << endl; else cout << n << endl;
#define debug(x) cout << #x << "=" << x << endl;
#define vdebug(v) cout << #v << "=" << endl; REP(i, v.size()){ cout << v[i] << ","; } cout << endl;
#define mdebug(m) cout << #m << "=" << endl; REP(i, m.size()){ REP(j, m[i].size()){ cout << m[i][j] << ","; } cout << endl;}
#define pb push_back
#define f first
#define s second
#define int long long
#define INF 1000000000000000000

using vec = vector<int>;
using mat = vector<vec>;
using Pii = pair<int, int>;
using PiP = pair<int, Pii>;
using PPi = pair<Pii, int>;
using bools = vector<bool>;
using pairs = vector<Pii>;

template<typename T> void readv(vector<T> &a){ REP(i, a.size()) cin >> a[i]; }
void readv_m1(vector<int> &a){ REP(i, a.size()){cin >> a[i]; a[i]--;} }

//int dx[4] = {1,0,-1,0};
//int dy[4] = {0,1,0,-1};

int mod = 1000000007;
//int mod = 998244353;
#define Add(x, y) x = (x + (y)) % mod
#define Mult(x, y) x = (x * (y)) % mod



signed main(){

    int N, L; cin >> N >> L;
    vec x(N); readv(x);
    vec y(N); readv(y);

    map<int, int> m;
    REP(i, N) m[x[i]] = 1;
    REP(i, N) m[y[i]] = 2;

    int c = 0, n = 0, d = 0;
    int mm = 0, dm;
    for(auto p: m){
        if(p.second == 1) c++;
        else{
            if(c >= n){
                n = c;
                d = p.first;
            }
            c--;
            if(c < mm){
                mm = c;
                dm = p.first;
            }
        }
    }

    int ans;
    if(mm >= 0) ans = (n - 1) * L + d;
    else{
        int ix = -1, iy = -1;
        if(x[0] < dm) ix = 0, iy = Lower_bound(y, dm);

        m.erase(m.begin(), m.end());
        REP(i, N) if(i != ix) m[(x[i] + L - dm) % L] = 1;
        REP(i, N) if(i != iy) m[(y[i] + L - dm) % L] = 2;

        c = 0, n = 0, d = 0;
        for(auto p: m){
            assert(c >= 0);
            if(p.second == 1) c++;
            else{
                if(c >= n){
                    n = c;
                    d = p.first;
                }
                c--;
            }
        }
        ans = dm + (n - 1) * L + d;
    }
    cout << ans << endl;

    return 0;
}