import sys
readline = sys.stdin.readline

N, M, T = map(int, readline().split())
mod = 998244353
G = [[] for i in range(N)]
for i in range(M):
    s, t = map(int, readline().split())
    G[s].append(t)
    G[t].append(s)
    

pre = [0] * N
pre[0] = 1
for _ in range(T):
    dp = [0] * N
    for i in range(N):
        for u in G[i]:
            dp[u] += pre[i]
            dp[u] %= mod
    dp, pre = pre, dp
print(pre[0])