N,M,T=map(int, input().split())
vs=[0]*M
vt=[0]*M
for i in range(M):
  vs[i],vt[i]=map(int, input().split())
dp=[[0 for i in range(T+1)] for j in range(N)]
dp[0][0]=1
for i in range(T):
  for j in range(M):
    dp[i+1][vs[j]]+=dp[i][vt[j]]
    dp[i+1][vs[j]]%=998244353
    dp[i+1][vt[j]]+=dp[i][vs[j]]
    dp[i+1][vt[j]]%=998244353
print(dp[T][0]%998244353)