import sys
input = lambda: sys.stdin.readline().rstrip()
mi = lambda: map(int,input().split())
li = lambda: list(mi())

mod = 998244353

n,m,t = mi()
g = [list() for _ in range(n)]
for _ in range(m):
	a,b = mi()
	g[a].append(b)
	g[b].append(a)

dp = [0]*n
dp[0] = 1
for time in range(t):
	nxt = [0]*n
	for cur in range(n):
		dp[cur] %= mod
		for to in g[cur]:
			nxt[to] += dp[cur]
	dp = nxt
print(dp[0]%mod)