import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.StringTokenizer;

public class Main {

	public static void main(String[] args) throws IOException {
		InputStream inputStream = System.in;
		OutputStream outputStream = System.out;
		InputReader in = new InputReader(inputStream);
		PrintWriter out = new PrintWriter(outputStream);
		TaskX solver = new TaskX();
		solver.solve(1, in, out);
		out.close();
	}

	static int INF = 1 << 30;
	static long LINF = 1L << 55;
	static int MOD = 1000000007;
	static int[] mh4 = { 0, -1, 1, 0 };
	static int[] mw4 = { -1, 0, 0, 1 };
	static int[] mh8 = { -1, -1, -1, 0, 0, 1, 1, 1 };
	static int[] mw8 = { -1, 0, 1, -1, 1, -1, 0, 1 };

	@SuppressWarnings("unchecked")
	static class TaskX {

		public void solve(int testNumber, InputReader in, PrintWriter out) {

			int n = in.nextInt(), m = in.nextInt();
			int[] a = new int[n];
			for (int i = 0; i < n; i++) {
				a[i] = i;
			}

			long[][] mat = new long[n][n];
			fill(mat, -1);
			for (int i = 0; i < m; i++) {
				int f = in.nextInt();
				int t = in.nextInt();
				int c = in.nextInt();
				mat[f][t] = c;
			}

			long ans = 0;
			do {
				long tmp = 0;

				for (int i = 0; i < n-1; i++) {
					if (mat[a[i]][a[i+1]] == -1) {
						tmp = 0;
						break;
					}
					tmp += mat[a[i]][a[i+1]];
				}

				ans = Math.max(ans, tmp);

			} while (Permutation.next(a));

			out.println(ans);
		}
	}

	static void fill(long[][] mat, long v) {
		for (int i = 0; i < mat.length; i++) {
			Arrays.fill(mat[i], v);
		}
	}

	static class P {
		int t, c;

		public P(int t, int c) {
			super();
			this.t = t;
			this.c = c;
		}

	}

	/**
	 * 順列(N!)
	 *
	 * @input {0 ～ n-1}の数が入った配列 ※配列は sort 済であること！！
	 * @output 順列に並びられた1回分の配列 a[]
	 *         配列 a[] の中の値が順列される。(次の順列になる)
	 *
	 * @sample
	 * while(Permutation.next(a)) {
	 * 		array[a[i]][a[i+1]]
	 * }
	 *
	 * */
	static class Permutation {

		// array ver
		public static boolean next(int[] a) {
			int n = a.length;

			int i = n - 1;
			while (i > 0 && a[i - 1] >= a[i])
				i--;
			if (i <= 0)
				return false;

			int j = n - 1;
			while (a[j] <= a[i - 1])
				j--;
			swap(a, i - 1, j);

			int k = n - 1;
			while (i < k)
				swap(a, i++, k--);

			return true;
		}

		private static void swap(int[] a, int i, int j) {
			int tmp = a[i];
			a[i] = a[j];
			a[j] = tmp;
		}

		// strings ver
		public static boolean next(char[] a) {
			int n = a.length;

			int i = n - 1;
			while (i > 0 && a[i - 1] >= a[i])
				i--;
			if (i <= 0)
				return false;

			int j = n - 1;
			while (a[j] <= a[i - 1])
				j--;
			swap(a, i - 1, j);

			int k = n - 1;
			while (i < k)
				swap(a, i++, k--);

			return true;
		}

		private static void swap(char[] a, int i, int j) {
			char tmp = a[i];
			a[i] = a[j];
			a[j] = tmp;
		}
	}

	static class InputReader {
		BufferedReader in;
		StringTokenizer tok;

		public String nextString() {
			while (!tok.hasMoreTokens()) {
				try {
					tok = new StringTokenizer(in.readLine(), " ");
				} catch (IOException e) {
					throw new InputMismatchException();
				}
			}
			return tok.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(nextString());
		}

		public long nextLong() {
			return Long.parseLong(nextString());
		}

		public double nextDouble() {
			return Double.parseDouble(nextString());
		}

		public int[] nextIntArray(int n) {
			int[] res = new int[n];
			for (int i = 0; i < n; i++) {
				res[i] = nextInt();
			}
			return res;
		}

		public int[] nextIntArrayDec(int n) {
			int[] res = new int[n];
			for (int i = 0; i < n; i++) {
				res[i] = nextInt() - 1;
			}
			return res;
		}

		public int[] nextIntArray1Index(int n) {
			int[] res = new int[n + 1];
			for (int i = 0; i < n; i++) {
				res[i + 1] = nextInt();
			}
			return res;
		}

		public long[] nextLongArray(int n) {
			long[] res = new long[n];
			for (int i = 0; i < n; i++) {
				res[i] = nextLong();
			}
			return res;
		}

		public long[] nextLongArrayDec(int n) {
			long[] res = new long[n];
			for (int i = 0; i < n; i++) {
				res[i] = nextLong() - 1;
			}
			return res;
		}

		public long[] nextLongArray1Index(int n) {
			long[] res = new long[n + 1];
			for (int i = 0; i < n; i++) {
				res[i + 1] = nextLong();
			}
			return res;
		}

		public double[] nextDoubleArray(int n) {
			double[] res = new double[n];
			for (int i = 0; i < n; i++) {
				res[i] = nextDouble();
			}
			return res;
		}

		public InputReader(InputStream inputStream) {
			in = new BufferedReader(new InputStreamReader(inputStream));
			tok = new StringTokenizer("");
		}
	}

}