from typing import List

M = List[List[int]]


class MatPow:
    __slots__ = ("_n", "_mod", "_base", "_cacheLevel", "_useCache", "_cache")

    def __init__(self, base: M, mod=1000000007, cacheLevel=4):
        n = len(base)
        b = [0] * n * n
        for i in range(n):
            for j in range(n):
                b[i * n + j] = base[i][j]
        useCache = cacheLevel >= 2
        self._n = n
        self._mod = mod
        self._base = b
        self._cacheLevel = cacheLevel
        self._useCache = useCache
        if useCache:
            self._cache = [[] for _ in range(cacheLevel - 1)]

    def pow(self, exp: int) -> M:
        if not self._useCache:
            return self._powWithOutCache(exp)
        if len(self._cache[0]) == 0:
            self._cache[0].append(self._base)
            for i in range(1, self._cacheLevel - 1):
                self._cache[i].append(self._mul(self._cache[i - 1][0], self._base))

        e = self._eye(self._n)
        div = 0
        while exp:
            if div == len(self._cache[0]):
                self._cache[0].append(
                    self._mul(self._cache[self._cacheLevel - 2][div - 1], self._cache[0][div - 1])
                )
                for i in range(1, self._cacheLevel - 1):
                    self._cache[i].append(self._mul(self._cache[i - 1][div], self._cache[0][div]))
            mod = exp % self._cacheLevel
            if mod:
                e = self._mul(e, self._cache[mod - 1][div])
            exp //= self._cacheLevel
            div += 1

        return self._to2D(e)

    def _mul(self, mat1: List[int], mat2: List[int]) -> List[int]:
        n = self._n
        res = [0] * n * n
        for i in range(n):
            for k in range(n):
                for j in range(n):
                    res[i * n + j] = (
                        res[i * n + j] + mat1[i * n + k] * mat2[k * n + j]
                    ) % self._mod
        return res

    def _powWithOutCache(self, exp: int) -> M:
        e = self._eye(self._n)
        b = self._base[:]
        while exp:
            if exp & 1:
                e = self._mul(e, b)
            exp >>= 1
            b = self._mul(b, b)
        return self._to2D(e)

    def _eye(self, n: int) -> List[int]:
        res = [0] * n * n
        for i in range(n):
            res[i * n + i] = 1
        return res

    def _to2D(self, mat: List[int]) -> M:
        n = self._n
        return [mat[i * n : (i + 1) * n] for i in range(n)]

    def __pow__(self, exp: int) -> M:
        return self.pow(exp)


n, m, k = map(int, input().split())
adjMatrix = [[0] * n for _ in range(n)]

for _ in range(m):
    u, v = map(int, input().split())
    adjMatrix[u][v] = 1
    adjMatrix[v][u] = 1

P = MatPow(adjMatrix, 998244353, cacheLevel=4)
res = P.pow(k)[0][0]
print(res)