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

dp = [0] * N
dp[0] = 1

for _ in range(T):
    new_dp = [0] * N
    for s in range(N):
        for t in G[s]:
            new_dp[s] += dp[t]
        new_dp[s] %= DIV
    dp = new_dp
    
print(dp[0])