import sys
#input = sys.stdin.readline
#input = sys.stdin.buffer.readline

def mat_dot(A, B, MOD=pow(10,9)+7):
  #A:n*m行列, B:m*l行列
  n, m, l = len(A), len(A[0]), len(B[0])
  X = [[0]*l for i in range(n)]
  for i in range(n):
    for j in range(l):
      temp = 0
      for k in range(m):
        temp = (temp + A[i][k] * B[k][j]) % MOD
      X[i][j] = temp
  return X
 
def mat_pow(A, x, MOD):
  #A^x
  n = len(A)
  X = [[0] * n for i in range(n)]
  for i in range(n):
    X[i][i] = 1
  for i in range(x.bit_length()):
    if (x>>i)&1:
      X = mat_dot(X, A, MOD)
    A = mat_dot(A, A, MOD)
  return X

def main():
    N,M,T = map(int,input().split()); MOD = 998244353
    X = [[0]*N for _ in range(N)]
    for _ in range(M):
        a,b = map(int,input().split())
        X[a][b] = 1
        X[b][a] = 1
    
    v = [[0] for _ in range(N)]
    v[0][0] = 1
    XT = mat_pow(X,T,MOD)
    ans = mat_dot(XT,v,MOD)
    #print(ans)
    print(ans[0][0])
    
        

if __name__ == '__main__':
    main()