n,m,K,S,T=map(int,input().split())
S-=1
T-=1
if K%2:
  print("Yes")
  exit()
e=[[] for i in range(n)]
for i in range(m):
  u,v=map(int,input().split())
  u-=1
  v-=1
  e[u]+=[v]
  e[v]+=[u]
v=[0]*n
q=[S]
v[S]=1
for s in q:
  for t in e[s]:
    if v[t]==0:
      v[t]=1
      q+=[t]
if v[T]==0:
  if sum(v)>1:
    print("Yes")
    exit()
  v=[0]*n
  q=[T]
  v[T]=1
  for s in q:
    for t in e[s]:
      if v[t]==0:
        v[t]=1
        q+=[t]
  if sum(v)>1:
    print("Yes")
    exit()
  print("No")
  exit()
if len(e[S])>=2 or len(e[T])>=2:
  print("Yes")
  exit()
if T not in e[S]:
  print("Yes")
  exit()
o=10**20
for i in range(n):
  if i in [S,T]:
    continue
  v=[-1]*n
  q=[i]
  v[i]=0
  for s in q:
    for t in e[s]:
      if v[t]==-1:
        v[t]=v[s]+1
        q+=[t]
      elif v[t]==v[s]:
        o=min(o,v[s]*2+1)
if o<=K-3:
  print("Yes")
  exit()
print("No")