# https://yukicoder.me/submissions/953174 
class UF:
    def __init__(self,n):
        self.p = [-1]*n
    def f(self,x):
        if self.p[x]<0: return x
        else: self.p[x] = self.f(self.p[x]); return self.p[x]
    def u(self,x,y):
        x = self.f(x); y = self.f(y)
        if x==y: return
        if -self.p[x]<-self.p[y]: x,y = y,x
        self.p[x] += self.p[y]; self.p[y] = x
    def s(self,x,y): return self.f(x) == self.f(y)
class DoublingLCA:
    def __init__(self,n,adj,root=0):
        self.logn = n.bit_length()
        self.ancestor,self.depth,self.weight = [[-1]*(n+1) for _ in range(self.logn)],[-1]*n,[[0]*(n+1) for _ in range(self.logn)]
        stack = [(root,-1,0)]
        while stack:
            v,p,dep = stack.pop()
            self.ancestor[0][v],self.depth[v] = p,dep
            for c,w in adj[v]:
                if c!=p:
                    stack.append((c,v,dep+1))
                    self.weight[0][c] = max(self.weight[0][c],w)
        for i in range(max(self.depth).bit_length()-1):
            for j in range(len(self.ancestor[i])):
                v = self.ancestor[i][j]
                u = self.ancestor[i][v]
                self.ancestor[i+1][j] = u
                self.weight[i+1][j] = max(self.weight[i][u],self.weight[i][v])
    def get_kth_ancestor(self,v,k):
        w = 0
        for i in range(k.bit_length()):
            if k>>i&1:
                v = self.ancestor[i][v]
                w = max(w,self.weight[i][v])
        return v,w
    def get_max_weight(self,u,v):
        depu,depv = self.depth[u],self.depth[v]
        if depu>depv: u,v,depu,depv = v,u,depv,depu
        v,w = self.get_kth_ancestor(v,depv-depu)
        if u==v: return w
        for k in range(depu.bit_length()-1,-1,-1):
            nu,nv = self.ancestor[k][u],self.ancestor[k][v]
            w = max(w,self.weight[k][u],self.weight[k][v])
            if nu!=nv: u,v = nu,nv
        return w
n,k,c = map(int,input().split())
wpuv = [(-1, -1, -1, -1) for _ in range(k)]
for i in range(k):
    u,v,w,p = map(int,input().split())
    wpuv[i] = (w,p,u-1,v-1)
uf = UF(n); d = m = 0; adj = [[] for _ in range(n)]
for w,p,u,v in sorted(wpuv):
    if uf.s(u,v): continue
    uf.u(u,v); d += w; m = max(m,p)
    adj[u-1].append((v,w)); adj[v-1].append((u,w))
if d>c: exit(print(-1))
lca = DoublingLCA(n,adj)
for w,p,u,v in wpuv:
    if d-lca.get_max_weight(u,v)+w<=c: m = max(m,p)
print(m)