from collections import defaultdict, deque

n, m, t = map(int, input().split())
edge = defaultdict(list)
for _ in range(m):
    a, b = map(int, input().split())
    edge[a].append(b)
    edge[b].append(a)
mod = 998244353

dp = [0 for _ in range(n)]
dp[0] = 1
for _ in range(t):
    ndp = [0 for _ in range(n)]
    for i in range(n):
        for j in edge[i]:
            ndp[j] += dp[i]
            ndp[j] %= mod
    dp = ndp[:]
print(dp[0])