MOD = 998244353

n, m, T = map(int, input().split())
edges = []
for _ in range(m):
    s, t = map(int, input().split())
    edges.append((s, t))
    
dp = [[0] * n for _ in range(T + 1)]
dp[0][0] = 1
for i in range(1, T + 1):
    for s, t in edges:
        dp[i][s] += dp[i - 1][t]
        dp[i][t] += dp[i - 1][s]
        dp[i][s] %= MOD
        dp[i][t] %= MOD
        
print(dp[-1][0])