import bisect import copy import decimal import fractions import heapq import itertools import math import random import sys import time from collections import Counter,deque,defaultdict from functools import lru_cache,reduce from heapq import heappush,heappop,heapify,heappushpop,_heappop_max,_heapify_max def _heappush_max(heap,item): heap.append(item) heapq._siftdown_max(heap, 0, len(heap)-1) def _heappushpop_max(heap, item): if heap and item < heap[0]: item, heap[0] = heap[0], item heapq._siftup_max(heap, 0) return item from math import gcd as GCD read=sys.stdin.read readline=sys.stdin.readline readlines=sys.stdin.readlines write=sys.stdout.write #import pypyjit #pypyjit.set_param('max_unroll_recursion=-1') #sys.set_int_max_str_digits(10**9) N,M,C=map(int,input().split()) graph=[[] for x in range(N)] for m in range(M): u,v,r,w=map(int,input().split()) u-=1;v-=1 graph[u].append((v,r,w)) graph[v].append((u,r,w)) for c in range(1,C+1): inf=1<<30 dist=[-inf]*N dist[0]=c queue=[(c,0)] while queue: dx,x=_heappop_max(queue) if dist[x]>dx: continue for y,r,w in graph[x]: dy=dx-dx//r-w if dist[y]=0: dist[y]=dy _heappush_max(queue,(dy,y)) ans=dist[N-1] if ans==-inf: ans=-1 print(ans)