//#include <bits/stdc++.h>

#include <iostream>
#include <algorithm>

#include <bitset>
#include <vector>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <stack>
#include <queue>
#include <deque>
#include <cstring>
#include <string>
#include <utility>
#include <array>
#include <complex>
#include <valarray>

#include <cassert>
#include <cmath>
#include <functional>
#include <iomanip>
#include <chrono>
#include <random>
#include <numeric>

#include<memory>


using namespace std;
#define int long long

typedef long long ll;
typedef unsigned long long ull;
//typedef unsigned __int128 HASH;
typedef pair<int,int> pii;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pullull;
typedef pair<ll,int> plli;
typedef pair<double,int> pdi;
typedef pair<long double, int> pdbi;
typedef pair<int,pii> pipii;
typedef pair<ll,pll> plpll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;
typedef vector<pii> vpii;
typedef vector<vector<int>> mat;

#define rep(i,n) for (int i=0;i<(n);i++)
#define rep2(i,a,b) for (int i=(a);i<(b);i++)
#define rrep(i,n) for (int i=(n);i>0;i--)
#define rrep2(i,a,b) for (int i=(a);i>b;i--)
#define pb push_back
#define fi first
#define se second
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()

const ll hmod1 = 999999937;
const ll hmod2 = 1000000000 + 9;
const int INF = 1<<30;
const ll INFLL = 1LL<<62;
const long double EPS = 1e-12;
const ll mod = 1000000000 + 7;
//const ll mod = 998244353;
const int dx4[4] = {1, 0, -1, 0};
const int dy4[4] = {0, 1, 0, -1};
const int dx8[8] = {1, 1, 1, 0, 0, -1, -1, -1};
const int dy8[8] = {0, 1, -1, 1, -1, 0, 1, -1};
const long double pi = 3.141592653589793;

#define addm(X, Y) (X) = ((X) + ((Y) % mod) + mod) % mod
#define inside(y, x, h, w) (0 <= (y) && (y) < (h) && 0 <= (x) && (x) < (w)) ? true : false

//debug
#define DEBUG

#define DUMPOUT cerr

#ifdef DEBUG
#define dump(...) DUMPOUT<<#__VA_ARGS__<<" :["<<__FUNCTION__<<":"<<__LINE__<<"]"<<endl; DUMPOUT<<"    "; dump_func(__VA_ARGS__)
#else
#define dump(...)
#endif

void dump_func() {DUMPOUT << endl;};

template <class Head, class... Tail> void dump_func(Head&& head, Tail&&... tail) {
    DUMPOUT << head;
    if (sizeof...(Tail) == 0) DUMPOUT << " ";
    else DUMPOUT << ", ";
    dump_func(std::move(tail)...);
}

//ostream
template<typename T> ostream& operator << (ostream& os, vector<T>& vec) {
    os << "["; for (int i = 0; i<vec.size(); i++) os << vec[i] << (i + 1 == vec.size() ? "" : ", "); os << "]";
    return os;
}

template<typename T, typename U> ostream& operator << (ostream& os, pair<T, U>& pair_var) {
    os << "(" << pair_var.first << ", " << pair_var.second << ")";
    return os;
}

template<typename T, typename U> ostream& operator << (ostream& os, map<T, U>& map_var) {
    os << "[";
    for (auto itr = map_var.begin(); itr != map_var.end(); itr++) {
        os << "(" << itr->first << ", " << itr->second << ")"; itr++;  if(itr != map_var.end()) os << ", "; itr--;
    }
    os << "]";
    return os;
}

template<typename T> ostream& operator << (ostream& os, set<T>& set_var) {
    os << "[";
    for (auto itr = set_var.begin(); itr != set_var.end(); itr++) {
        os << *itr; ++itr; if(itr != set_var.end()) os << ", "; itr--;
    }
    os << "]";
    return os;
}

int n, m;
int L;
struct edge{int to, cost;};
vector<vector<edge>> g(300+ 5);
vector<vector<int>> dist(300+5);

vector<ll> dijkstra(int s, int n, vector<vector<edge>>& g){
    priority_queue<pair<pii, int>, vector<pair<pii, int>>, greater<pair<pii, int>>> pque;
    vector<ll> d(300+5, INFLL);
    vector<ll> cnt(300+5, INFLL);
    vector<ll> fuel(300+5, 0);
    bool ok[n] = {};
    d[s] = 0;
    cnt[s] = 0;
    fuel[s] = L;
    pque.push({{0, -L}, s});

    while (!pque.empty()){
        pair<pii, int> p = pque.top(); pque.pop();
        int fr = p.second;
        if (ok[fr]) continue;
        ok[fr] = true;
        for (edge e: g[fr]){
          if (e.cost > L) continue;
          if (cnt[e.to] > cnt[fr]) {
            if (e.cost <= fuel[fr]) {
              fuel[e.to] = fuel[fr] - e.cost;
              cnt[e.to] = cnt[fr];
              pque.push({{cnt[e.to], -fuel[e.to]}, e.to});
            }
            else {
              if (cnt[e.to] == cnt[fr]+1) {
                if (fuel[e.to] < L - e.cost) {
                  fuel[e.to] = L - e.cost;
                  cnt[e.to] = cnt[fr]+1;
                  pque.push({{cnt[e.to], -fuel[e.to]}, e.to});
                }
              }
              else {
                fuel[e.to] = L - e.cost;
                cnt[e.to] = cnt[fr]+1;
                pque.push({{cnt[e.to], -fuel[e.to]}, e.to});
              }
            }
          }
          else if (cnt[e.to] == cnt[fr]) {
            int rest_fuel = fuel[fr] - e.cost;
            if (rest_fuel < 0) continue;
            if (rest_fuel > fuel[e.to]) {
              fuel[e.to] = rest_fuel;
              pque.push({{cnt[e.to], -fuel[e.to]}, e.to});
            }
          }
        }
    }
    return cnt;
}


signed main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cin >> n >> m >> L;
  rep(i, m) {
    int a, b, c;
    cin >> a >> b >> c;
    a--; b--;
    g[a].push_back(edge{b, c});
    g[b].push_back(edge{a, c});
  }
  rep(i, n) {
    dist[i] = dijkstra(i, n, g);
  }
  int q;
  cin >> q;
  rep(i, q) {
    int s, t;
    cin >> s >> t;
    s--; t--;
    if (dist[s][t] == INFLL) cout << -1 << endl;
    else cout << dist[s][t] << endl;
  }
}


Measured memory_bytes: 3584