n,m,t = map(int, input().split())
graph = [[] for i in range(n)]
for i in range(m):
    a, b = map(int, input().split())
    graph[a].append(b)
    graph[b].append(a)

mod = 998244353
ans = [0]*n
ans[0] = 1
for _ in range(t):
    ans_copy = ans.copy()
    for to in range(n):
        ans[to] = 0
        for fr in graph[to]:
            ans[to] += ans_copy[fr]
            ans[to] %= mod
print(ans[0])