import java.io.FileNotFoundException;
import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Random;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws FileNotFoundException {
		new Main().run();
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		int MAX_ = sc.nextInt();
		if (!(1 <= MAX_ && MAX_ <= 1e7)) {
			throw new AssertionError();
		}
		int m = sc.nextInt();
		if (!(1 <= m && m <= 5 * 1e5)) {
			throw new AssertionError();
		}
		int[] x = new int[m];
		int[] d = new int[m];
		int[][] y = new int[m][];
		int sumd = 0;
		for (int i = 0; i < m; ++i) {
			x[i] = sc.nextInt();
			d[i] = sc.nextInt();
			if (!(d[i] > 0)) {
				throw new AssertionError();
			}
			if (!(0 <= x[i] && x[i] < MAX_))
				throw new AssertionError();
			sumd += d[i];
			y[i] = new int[d[i]];
			for (int j = 0; j < d[i]; ++j) {
				y[i][j] = sc.nextInt();
				if (!(0 <= y[i][j] && y[i][j] < MAX_))
					throw new AssertionError();
			}
		}
		if (!(1 <= sumd && sumd <= 1e6)) {
			throw new AssertionError();
		}
		System.out.println(solver(MAX_, m, x, d, y));
	}

	int MAX = 0;
	int INF = Integer.MAX_VALUE / 10;

	int solve(int[] l, int[] r) {
		int r1 = INF;
		int r2 = -INF;
		int l1 = INF;
		int l2 = -INF;
		// r1 -> r[r1]が最左
		// l1 <- (arg l=l1)が最左
		for (int i = 0; i < MAX; ++i) {
			if (r[i] != -1 && r1 == INF) {
				r1 = i;
			}
			if (l[i] != -1 && l1 == INF) {
				l1 = l[i];
			}
		}
		for (int i = MAX - 1; i >= 0; --i) {
			if (r[i] != -1 && r2 == -INF) {
				r2 = r[i];
			}
			if (l[i] != -1 && l2 == -INF) {
				l2 = i;
			}
		}
		for (int i = Math.min(l1, r1) + 1; i < Math.max(l2, r2); ++i) {
			if (l[i] == i) {
				l[i] = -1;
			}
			if (r[i] == i) {
				r[i] = -1;
			}
		}
		int[] arg_l = new int[MAX];
		Arrays.fill(arg_l, -1);
		for (int i = 0; i < l.length; ++i) {
			if (l[i] != -1) {
				arg_l[l[i]] = i;
			}
		}
		int[] middle = new int[MAX];
		for (int i = MAX - 1; i >= 0; --i) {
			if (l[i] != i && l[i] != -1) {
				++middle[i - 1];
				--middle[l[i]];
			}
			if (i + 1 < MAX) {
				middle[i] = middle[i + 1] + middle[i];
			}
		}
		int[][] s = new int[2][MAX];
		for (int i = 0; i < s.length; ++i) {
			for (int j = 0; j < s[i].length; ++j) {
				s[i][j] = INF;
			}
		}

		for (int i = Math.min(r1, l1); i <= Math.max(r2, l2); ++i) {
			if (r1 <= i && i < l1) {
				s[0][i] = i - r1;
			}
			if (l[i] == i || (middle[i] == 0 && l[i] == -1 && arg_l[i] == -1)) {// 何もなし
				s[0][i] = Math.min(s[0][i], 2 * Math.abs(i - Math.min(l1, r1)));
				if (i == 0) {
					s[1][i] = 0;
					s[0][i] = 0;
				} else {
					s[1][i] = Math.min(s[1][i], Math.min(s[1][i - 1] + 3, s[0][i - 1] + 1));
					s[0][i] = Math.min(s[0][i], Math.min(s[1][i - 1] + 3, s[0][i - 1] + 1));
				}
			} else if (l[i] != -1 && l[i] != i && arg_l[i] != -1 && arg_l[i] != i) {// 配達元かつ配達先
				s[1][i] = Math.min(s[1][i], s[1][i - 1] + 3);
			} else if (middle[i] > 0) {// 配達途中
				s[1][i] = Math.min(s[1][i], s[1][i - 1] + 3);
			} else if (arg_l[i] != -1 && i != 0) {// 配達先
				s[1][i] = Math.min(s[1][i], Math.min(s[0][i - 1] + 1, s[1][i - 1] + 3));
			} else if (l[i] != -1) {// 配達元
				s[1][i] = Math.min(s[1][i], s[1][i - 1] + 3);
				s[0][i] = Math.min(s[0][i], s[1][i - 1] + 3);
				s[0][i] = Math.min(s[0][i], 2 * Math.abs(i - Math.min(l1, r1)));
			} else {
				if (i == 0) {

				} else
					throw new AssertionError();
			}
		}

		int ans = 2 * (Math.max(l2, r2) - Math.min(l1, r1));
		for (int i = 0; i < MAX; ++i) {
			ans = Math.min(ans, s[0][i] + 2 * Math.abs(i - Math.max(l2, r2)) - (i == Math.max(l2, r2) ? 0 : 1));
		}
		return ans;
	}

	int solver(int MAX_, int m, int[] x, int[] d, int[][] y) {
		++MAX_;
		MAX = MAX_;
		int[] r = lr(MAX_, m, x, d, y)[1];
		int[] l = lr(MAX_, m, x, d, y)[0];
		int[] invl = new int[MAX];
		int[] invr = new int[MAX];
		Arrays.fill(invl, -1);
		Arrays.fill(invr, -1);
		for (int i = 0; i < MAX; ++i) {
			if (l[i] != -1) {
				int src = (MAX - 1) - i;
				int dst = (MAX - 1) - l[i];
				invr[src] = dst;
			}
			if (r[i] != -1) {
				int src = (MAX - 1) - i;
				int dst = (MAX - 1) - r[i];
				invl[src] = dst;
			}
		}
		return Math.max(0, Math.min(solve(l, r), solve(invl, invr)));
	}

	int[][] lr(int MAX_, int m, int[] x, int[] d, int[][] y) {
		MAX = MAX_;
		int[] r = new int[MAX];
		int[] l = new int[MAX];

		Arrays.fill(r, -1);
		Arrays.fill(l, -1);
		for (int i = 0; i < m; ++i) {
			int ma = r[x[i]] != -1 ? r[x[i]] : x[i] - 1;
			int mi = l[x[i]] != -1 ? l[x[i]] : x[i] + 1;
			for (int j = 0; j < d[i]; ++j) {
				ma = Math.max(ma, y[i][j]);
				mi = Math.min(mi, y[i][j]);
			}
			if (ma >= x[i]) {
				r[x[i]] = ma;
			}
			if (mi <= x[i]) {
				l[x[i]] = mi;
			}
		}
		{
			int ma = -1;
			for (int i = 0; i < MAX; ++i) {
				if (r[i] == -1)
					continue;
				if (ma < r[i]) {
					ma = r[i];
				} else if (ma >= r[i]) {
					r[i] = -1;
				}
			}
		}
		{
			int mi = MAX * 10;
			for (int i = MAX - 1; i >= 0; --i) {
				if (l[i] == -1)
					continue;
				if (mi > l[i]) {
					mi = l[i];
				} else if (mi <= l[i]) {
					l[i] = -1;
				}
			}
		}
		return new int[][] { l, r };
	}

	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}

}