mod = 998244353
n,m,t = map(int,input().split())
G = [[] for _ in range(n)]
for _ in range(m):
    u,v = map(int,input().split())
    G[u].append(v)
    G[v].append(u)
C = [0]*n
C[0] = 1
for _ in range(t):
    C = [sum(C[u] for u in G[i])%mod for i in range(n)]
print(C[0])