from copy import deepcopy

MOD = 998244353

n, m, T = map(int, input().split())
A = [[0] * n for _ in range(n)]
B = [0] * n
B[0] = 1
for _ in range(m):
    s, t = map(int, input().split())
    A[s][t] = 1
    A[t][s] = 1
    
while T:
    if T & 1:
        C = [0] * n
        for i in range(n):
            for j in range(n):
                C[i] += A[i][j] * B[j]
            C[i] %= MOD
        B = C.copy()
    T >>= 1
    C = [[0] * n for _ in range(n)]
    for i in range(n):
        for j in range(n):
            for k in range(n):
                C[i][j] += A[i][k] * A[k][j]
            C[i][j] %= MOD
    A = deepcopy(C)
print(B[0])