mod = 998244353
eps = 10**-9


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

    def matmul(A, B):
        C = [[0] * len(B[0]) for _ in range(len(A))]
        for i in range(len(A)):
            for k in range(len(B)):
                for j in range(len(B[0])):
                    C[i][j] = (C[i][j] + A[i][k] * B[k][j]) % mod
        return C

    def matpow(A, p):
        n = len(A)
        B = [[0] * n for _ in range(n)]
        for i in range(n):
            B[i][i] = 1
        while p > 0:
            if p & 1:
                B = matmul(B, A)
            A = matmul(A, A)
            p >>= 1
        return B

    N, M, T = map(int, input().split())
    mat = [[0] * N for _ in range(N)]
    for _ in range(M):
        s, t = map(int, input().split())
        mat[s][t] = 1
        mat[t][s] = 1

    vec = [[0] * N]
    vec[0][0] = 1
    print(matmul(matpow(mat, T), vec)[0][0])


if __name__ == '__main__':
    main()