import sys
input = lambda :sys.stdin.readline()[:-1]
ni = lambda :int(input())
na = lambda :list(map(int,input().split()))
yes = lambda :print("yes");Yes = lambda :print("Yes");YES = lambda : print("YES")
no = lambda :print("no");No = lambda :print("No");NO = lambda : print("NO")
######################################################################

n, m, c = na()
g = [[] for i in range(n)]

for i in range(m):
    u,v,r,w = na()
    u -= 1
    v -= 1
    g[u].append((v,r,w))
    g[v].append((u,r,w))

visited = [[0] * (c+1) for i in range(n)]
ans = -1

for C in range(1, c+1):
    visited[0][C] = 1
    q = [(0,C)]
    while q:
        u,cc = q.pop(0)
        #print(u, cc)
        if u == n-1:
            ans = max(ans, cc)
        for v,r,w in g[u]:
            nc = cc - cc// r - w
            if nc >= 0 and not visited[v][nc]:
                visited[v][nc] = 1
                q.append((v,nc))
    print(ans)