mod = 998244353
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N, M, T = map(int, input().split())
    E = []
    for _ in range(M):
        E.append(tuple(map(int, input().split())))

    dp = [[0] * N for _ in range(T+1)]
    dp[0][0] = 1
    for t in range(1, T+1):
        for u, v in E:
            dp[t][u] = (dp[t][u] + dp[t - 1][v])%mod
            dp[t][v] = (dp[t][v] + dp[t - 1][u]) % mod
    print(dp[-1][0])


if __name__ == '__main__':
    main()