#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
const i64 INF = LLONG_MAX / 4;
void chmin(i64& a, i64 b) { if(a > b) a = b; }

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    i64 N, M, X;
    cin >> N >> M >> X;
    vector g(N, vector<array<i64, 3>>{});
    
    vector<i64> width = {-1};
    while(M--) {
        i64 a, b, d, w;
        cin >> a >> b >> d >> w;
        a--; b--;
        g[a].push_back({b, d, w});
        g[b].push_back({a, d, w});
        
        width.push_back(w);
    }
    
    sort(width.begin(), width.end());
    
    auto check = [&](i64 i_) -> bool {
        const i64 W = width[i_];
        vector cost(N, INF);
        priority_queue q(greater<>{}, vector<pair<i64, i64>>{});
        auto push = [&](i64 i, i64 c) {
            if(cost[i] <= c) return;
            cost[i] = c;
            q.emplace(c, i);
        };
        push(0, 0);
        while(q.size()) {
            auto [c, i] = q.top();
            q.pop();
//            if(cost[i] != c) continue;
            for(auto [j, d, w] : g[i]) if(w >= W) push(j, c + d);
        }
        return cost.back() <= X;
    };
    
    i64 ok = 0, ng = width.size();
    while(ng - ok > 1) {
        const i64 mid = (ok + ng) / 2;
        (check(mid) ? ok : ng) = mid;
    }
    cout << width[ok] << endl;
}