#include <bits/stdc++.h>
#define int long long
using namespace std;
int k, m;
int dp[505][105];
vector <pair <int, int>> layer[505];
int dist (pair <int, int> a, pair <int, int> b)
{
int ret=1ll << 60;
pair <int, int> d={abs (b.first-a.first), abs (b.second-a.second)};
if (m==1)
return d.first+d.second;
int v_x=d.first/(m+1)*(m+1);
int v_y=d.second/(m+1)*(m+1);
for (auto p : vector <pair <int, int>>{{v_x, v_y}, {v_x, v_y+m+1}, {v_x+m+1, v_y}, {v_x+m+1, v_y+m+1}})
{
int res=p.first/(m+1)*2+p.second/(m+1)*2;
res+=abs (p.first-d.first)!=0 && p.second==0?2+abs (p.first-d.first):abs (p.first-d.first);
res+=abs (p.second-d.second)!=0 && p.first==0?2+abs (p.second-d.second):abs (p.second-d.second);
ret=min (ret, res);
}
return ret;
}
int32_t main ()
{
memset (dp, 0x3f, sizeof(dp));
ios_base :: sync_with_stdio (0);
cin.tie (nullptr);
cin >> k >> m;
int s_x, s_y, e_x, e_y;
cin >> s_x >> s_y >> e_x >> e_y;
pair <int, int> s={s_x, s_y}, e={e_x, e_y};
layer[0].push_back (s);
for (int i=1;i<k;i++)
{
int cnt;
cin >> cnt;
for (int j=1;j<=cnt;j++)
{
int x, y;
cin >> x >> y;
layer[i].push_back ({x, y});
}
}
layer[k].push_back (e);
dp[0][0]=0;
for (int i=0;i<k;i++)
{
for (int j=0;j<layer[i].size();j++)
{
for (int k=0;k<layer[i+1].size();k++)
{
dp[i+1][k]=min (dp[i+1][k], dp[i][j]+dist (layer[i][j], layer[i+1][k]));
}
}
}
cout << dp[k][0];
return 0;
}
