MOD = 998244353
n, m, tt = map(int, input().split())
g = [[] for _ in range(n)]
for i in range(m):
    s, t = map(int, input().split())
    g[s].append(t)
    g[t].append(s)
d = [0] * n
d[0] = 1
for i in range(tt):
    tmp = [0] * n
    for j in range(n):
        for v in g[j]:
            tmp[j] += d[v]
    for j in range(n):
        tmp[j] %= MOD
    d = tmp[:]
print(d[0])