void main(){
  import std.stdio, std.string, std.conv, std.algorithm;

  int n, m; rd(n, m);
  auto xs=new int[](m), ls=new int[](m);
  auto ys=new int[][](m);
  foreach(i; 0..m){
    rd(xs[i], ls[i]);
    ys[i]=readln.split.to!(int[]);
  }

  int mn=1_000_000_000;
  mn=min(mn, solve(n, m, xs, ls, ys));
  foreach(i; 0..m){
    xs[i]=(n-xs[i]-1);
    foreach(j; 0..ls[i]) ys[i][j]=(n-ys[i][j]-1);
  }
  mn=min(mn, solve(n, m, xs, ls, ys));

  writeln(mn);
}

int solve(int n, int m, int[] xs, int[] ls, int[][] ys){
  import std.algorithm;
  auto c=new int[](n);
  int l=n, r=-1;
  foreach(i; 0..m){
    l=min(l, xs[i]); r=max(r, xs[i]);
    foreach(y; ys[i]){
      l=min(l, y); r=max(r, y);
      if(y<xs[i]) c[y]++, c[xs[i]]--;
    }
  }
  foreach(i; 1..n) c[i]+=c[i-1];
  auto rec=new int[][][](2, 3, 3); // R, LR, RLR
                                   // (st, ed)=(F, F), (T, F), (T, T)
  const inf=1_000_000_000;
  foreach(t; 0..2)foreach(k; 0..3) fill(rec[t][k], inf);
  rec[l&1][1][0]=2;
  if(c[l]==0) rec[l&1][0][1]=1;
  for(auto i=l+1; i<r; i++){
    auto t=i&1;
    auto nex=rec[t], cur=rec[t^1];
    foreach(k; 0..3) fill(nex[k], inf);
    
    foreach(j; 0..3){
      chmin(nex[2][j], cur[0][j]+3);
      chmin(nex[1][j], cur[1][j]+2);
      chmin(nex[2][j], cur[2][j]+3);
      if(c[i]==0){
        if(j<=1) chmin(nex[0][j], cur[0][j]+1);
        if(j==0) chmin(nex[0][j+1], cur[1][j]+1);
        chmin(nex[0][j], cur[2][j]+1);
      }
      if(j==1) chmin(nex[1][j+1], cur[0][j]+2);
    }
  }

  int ret=inf;
  chmin(ret, min(rec[(r&1)^1][0][2], rec[(r&1)^1][1][2])); 
  chmin(ret, min(rec[(r&1)^1][0][1], rec[(r&1)^1][1][1]));
  chmin(ret, rec[(r&1)^1][1][0]);
  return ret;
}

void chmin(T)(ref T l, T r){
  if(l>r) l=r;
}

void rd(T...)(ref T x){
  import std.stdio, std.string, std.conv;
  auto l=readln.split;
  assert(l.length==x.length);
  foreach(i, ref e; x){
    e=l[i].to!(typeof(e));
  }
}
void wr(T...)(T x){
  import std.stdio;
  foreach(e; x) write(e, " ");
  writeln();
}