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.ancestor,self.depth,self.weight = [[-1]*(n+1)],[-1]*n,[[0]*(n+1)]
        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 _ in range(max(self.depth).bit_length()-1):
            next_ancestor = []; next_weight = []
            for v in self.ancestor[-1]:
                u = self.ancestor[-1][v]
                next_ancestor.append(u)
                next_weight.append(max(self.weight[-1][u],self.weight[-1][v]))
            self.ancestor.append(next_ancestor)
            self.weight.append(next_weight)
    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 = []
for _ in range(k):
    u,v,w,p = map(int,input().split())
    wpuv.append((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)