n,m,T = map(int,input().split())
load = [[] for i in range(n)]
for i in range(m):
  s,t = map(int,input().split())
  load[s].append(t)
  load[t].append(s)
mod = 998244353
dp = [0 for i in range(n)]
dp[0] = 1
for i in range(T):
  new = [0 for j in range(n)]
  for j in range(n):
    for k in load[j]:
      new[j] += dp[k]
      new[j] %= mod
  dp = new
print(dp[0])