N,M,T = map(int,input().split())
G = [[] for i in range(N)]
for i in range(M):
    s,t = map(int,input().split())
    G[s].append(t)
    G[t].append(s)
    
dp = [0] * N
dp[0] = 1

DIV = 998244353
for _ in range(T):
    new_dp = [0] * N
    for i in range(N):
        for child in G[i]:
            new_dp[child] += dp[i]
            new_dp[child] %= DIV
    dp = new_dp
print(dp[0])