N,M,T = map(int,input().split())
A = [[0] * N for _ in range(N)]
X = [[0] * N for _ in range(N)]

for _ in range(M):
    s,t = map(int,input().split())
    A[s][t] = 1
    A[t][s] = 1
for i in range(N):
    X[i][i] = 1

MOD = 998244353
D = N
def mt(A, B):
    C = [[0] * D for _ in range(D)]
    for i in range(D):
        for j in range(D):
            tmp = 0
            for k in range(D):
                tmp += A[i][k] * B[k][j]
                tmp %= MOD
            C[i][j] = tmp
    return C

while T > 0:
    if T & 1:
        X = mt(A,X)
    A = mt(A,A)
    T >>= 1

print(X[0][0])