n,m,k=map(int,input().split())
a=list(map(int,input().split()))
e=[[] for i in range(n)]
for _ in range(m):
  u,v=map(int,input().split())
  u-=1
  v-=1
  e[u]+=[v]
  e[v]+=[u]

r=list(range(n))

def union(x,y):
  rx=root(x)
  ry=root(y)
  if rx==ry:
    return
  if a[rx]<a[ry]:
    rx,ry=ry,rx
  r[ry]=rx
  return

def root(x):
  p=x
  l=[p]
  while r[p]!=p:
    p=r[p]
    l+=[p]
  for p in l:
    r[p]=l[-1]
  return r[x]

for s in sorted(list(range(n)),key=lambda i:a[i]):
  e[s].sort(key=lambda i:a[i])
  for t in e[s]:
    if 0<abs(a[root(t)]-a[root(s)])<=k:
      union(s,t)

print(["No","Yes"][len(set(a[root(i)] for i in range(n)))==1])