/* -*- coding: utf-8 -*-
 *
 * 1502.cc:  No.1502 Many Simple Additions - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 100000;
const int MOD = 1000000007;

/* typedef */

typedef long long ll;
typedef queue<int> qi;
typedef pair<int,int> pii;
typedef vector<pii> vpii;

/* global variables */

vpii nbrs[MAX_N];
int ps[MAX_N], as[MAX_N];
ll bs[MAX_N];

/* subroutines */

/* main */

int main() {
  int n, m, k;
  scanf("%d%d%d", &n, &m, &k);

  for (int i = 0; i < m; i++) {
    int x, y, z;
    scanf("%d%d%d", &x, &y, &z);
    x--, y--;
    nbrs[x].push_back(pii(y, z));
    nbrs[y].push_back(pii(x, z));
  }

  int p0 = 1, p1 = 1;
  for (int st = 0; st < n; st++)
    if (as[st] == 0) {
      ps[st] = -1;
      as[st] = 1, bs[st] = 0;
      int minx = 1, maxx = k;
      bool minf = false, maxf = true;

      qi q;
      q.push(st);

      while (! q.empty()) {
	int u = q.front(); q.pop();

	for (auto pe: nbrs[u]) {
	  int v = pe.first;
	  ll z = pe.second;
	  if (as[v] == 0) {
	    ps[v] = u;
	    // (au*x+bu)+(av*x+bv)=z -> av*x+bv=-au*x+(z-bu)
	    as[v] = -as[u], bs[v] = z - bs[u];

	    // 1<=av*x+bv<=k -> 1-bv<=av*x<=k-bv
	    if (as[v] > 0) {
	      // av == 1 -> 1-bv<=x<=k-bv
	      ll x0 = 1 - bs[v], x1 = k - bs[v];
	      if (maxx < x0 || x1 < minx) { puts("0"); return 0; }
	      if (minx < x0) minx = x0, minf = false;
	      if (maxx > x1) maxx = x1, maxf = true;
	    }
	    else {
	      // av == -1 -> bv-1>=x>=bv-k
	      ll x0 = bs[v] - k, x1 = bs[v] - 1;
	      if (maxx < x0 || x1 < minx) { puts("0"); return 0; }
	      if (minx < x0) minx = x0, minf = true;
	      if (maxx > x1) maxx = x1, maxf = false;
	    }
	    q.push(v);
	  }
	  else if (v != ps[u]) {
	    int sa = as[u] + as[v];
	    ll sb = bs[u] + bs[v];
	    if (sa == 0) {
	      if (sb != z) { puts("0"); return 0; }
	    }
	    else {
	      if ((z - sb) & 1) { puts("0"); return 0; }
	      ll x = (z - sb) / sa;
	      bool f = (as[u] * x + bs[u] == k) || (as[v] * x + bs[v] == k);
	      if (maxx < x || x < minx) { puts("0"); return 0; }
	      if (minx < x) minx = x, minf = f;
	      if (maxx > x) maxx = x, maxf = f;
	    }
	  }
	}
      }
      //printf("minx=%d,minf=%d maxx=%d,maxf=%d\n", minx, minf, maxx, maxf);

      int r1 = maxx - minx + 1;
      int r0 = r1 - (minf ? 1 : 0) - (maxf ? 1 : 0);
      p0 = (ll)p0 * r0 % MOD;
      p1 = (ll)p1 * r1 % MOD;
    }

  printf("%d\n", (p1 + MOD - p0) % MOD);
  return 0;
}