Boboniu has a directed graph with n vertices and m edges.

The out-degree of each vertex is at most k.

Each edge has an integer weight between 1 and m. No two edges have equal weights.

Boboniu likes to walk on the graph with some specific rules, which is represented by a tuple (c_1,c_2,…,c_k). If he now stands on a vertex u with out-degree i, then he will go to the next vertex by the edge with the c_i-th (1≤ c_i≤ i) smallest weight among all edges outgoing from u.

Now Boboniu asks you to calculate the number of tuples (c_1,c_2,…,c_k) such that

  * 1≤ c_i≤ i for all i (1≤ i≤ k). 
  * Starting from any vertex u, it is possible to go back to u in finite time by walking on the graph under the described rules. 

Input

The first line contains three integers n, m and k (2≤ n≤ 2⋅ 10^5, 2≤ m≤ min(2⋅ 10^5,n(n-1) ), 1≤ k≤ 9).

Each of the next m lines contains three integers u, v and w (1≤ u,v≤ n,u≠ v,1≤ w≤ m), denoting an edge from u to v with weight w. It is guaranteed that there are no self-loops or multiple edges and each vertex has at least one edge starting from itself.

It is guaranteed that the out-degree of each vertex is at most k and no two edges have equal weight.

Output

Print one integer: the number of tuples.

Examples

Input


4 6 3
4 2 1
1 2 2
2 4 3
4 1 4
4 3 5
3 1 6


Output


2


Input


5 5 1
1 4 1
5 1 2
2 5 3
4 3 4
3 2 5


Output


1


Input


6 13 4
3 5 1
2 5 2
6 3 3
1 4 4
2 6 5
5 3 6
4 1 7
4 3 8
5 2 9
4 2 10
2 1 11
6 1 12
4 6 13


Output


1

Note

For the first example, there are two tuples: (1,1,3) and (1,2,3). The blue edges in the picture denote the c_i-th smallest edges for each vertex, which Boboniu chooses to go through.

<image>

For the third example, there's only one tuple: (1,2,2,2).

<image>

The out-degree of vertex u means the number of edges outgoing from u.
#include <bits/stdc++.h>
using namespace std;
const long long maxn = 2e5 + 5;
const long long hash_mod = 167;
long long rd() {
  long long _;
  scanf("%lld", &_);
  return _;
}
long long n, m, k, ans;
unsigned long long a[10][10], hash_val[maxn], hash_sum;
vector<pair<long long, long long> > edge[maxn];
void dfs(long long i) {
  if (i > k) {
    ans += !hash_sum;
    return;
  }
  for (long long j = 1; j <= i; j++) {
    hash_sum -= a[i][j];
    dfs(i + 1);
    hash_sum += a[i][j];
  }
}
int main() {
  n = rd(), m = rd(), k = rd();
  hash_val[0] = 1;
  for (long long i = 1; i <= n; i++)
    hash_val[i] = hash_val[i - 1] * hash_mod, hash_sum += hash_val[i];
  for (long long i = 0; i < m; i++) {
    long long u = rd(), v = rd(), w = rd();
    edge[u].push_back({w, v});
  }
  for (long long u = 1; u <= n; u++) {
    if (edge[u].empty()) return printf("0\n"), 0;
    sort(edge[u].begin(), edge[u].end());
    for (long long j = 0; j < edge[u].size(); j++)
      a[edge[u].size()][j + 1] += hash_val[edge[u][j].second];
  }
  dfs(1);
  printf("%lld\n", ans);
  return 0;
}
