import heapq
def daiku(s,num):
    hq=[]
    heapq.heappush(hq,[0,s])
    high=[-1 for _ in range(N)]
    karidist=[10**15 for _ in range(N)]
    while len(hq)!=0:
        h,p=heapq.heappop(hq)
        if high[p]==-1:
            high[p]=h
            for e,c,m in edge[p]:
                if m>=num and karidist[e]>h+c:
                    karidist[e]=h+c
                    heapq.heappush(hq,[h+c,e])
    return high[-1]

def nibun():
    left,right=-1,10**9+1
    while right-left>1:
        mid=(right+left)//2
        dist=daiku(0,mid)
        if dist!=-1 and dist<=X:
            left=mid
        else:
            right=mid
    return left

N,M,X=map(int,input().split())
edge=[[] for _ in range(N)]
for _ in range(M):
    u,v,a,b=map(int,input().split())
    edge[u-1].append([v-1,a,b])
print(nibun())