N,M,T=map(int,input().split())
graph=[[] for x in range(N)]
for m in range(M):
    s,t=map(int,input().split())
    graph[s].append(t)
    graph[t].append(s)
dp=[0]*N
dp[0]=1
mod=998244353
for t in range(T):
    dp=[sum(dp[y] for y in graph[x])%mod for x in range(N)]
ans=dp[0]
print(ans)