N, M, T = map(int, input().split())
A = [[0]*N for _ in range(N)]
mod = 998244353
for i in range(M):
    s, t = map(int, input().split())
    A[s][t] = 1
    A[t][s] = 1

def mat_mul(a, b) :
    I, J, K = len(a), len(b[0]), len(b)
    c = [[0] * J for _ in range(I)]
    for i in range(I) :
        for j in range(J) :
            for k in range(K) :
                c[i][j] += a[i][k] * b[k][j]
                c[i][j] %= mod
    return c

def mat_pow(x, n):
    y = [[0] * len(x) for _ in range(len(x))]
    for i in range(len(x)):
        y[i][i] = 1
    while n > 0:
        if n & 1:
            y = mat_mul(x, y)
        x = mat_mul(x, x)
        n >>= 1
    return y

res = mat_pow(A, T)
print(res[0][0])