N, M, T = map(int, input().split())
MOD = 998244353

edges = [tuple(map(int, input().split())) for _ in range(M)]

dp = [0] * N
dp[0] = 1
for _ in range(T):
    new_dp = [0] * N
    for s, t in edges:
        new_dp[s] += dp[t]
        new_dp[s] %= MOD
        new_dp[t] += dp[s]
        new_dp[t] %= MOD
    dp = new_dp
print(dp[0])