N,M,T = map(int,input().split())
e = [[] for _ in range(N)]
for _ in range(M):
    s,t = map(int,input().split())
    e[s].append(t)
    e[t].append(s)
    
k0 = [0]*N
k1 = [0]*N
mod = 998244353
k0[0] = 1
for i in range(T):
    k1 = [0]*N
    for j in range(N):
        for t in e[j]:
            k1[t] += k0[j]
            k1[t] %= mod
    k0 = list(k1)
print(k0[0])