n,m,T = map(int,input().split())
st = [[] for i in range(n)]
mod = 998244353

for i in range(m):
    s,t = map(int,input().split())
    st[s].append(t)
    st[t].append(s)

ct = [0]*n
ct[0] = 1

for i in range(T):
    nct = [0]*n
    for j in range(n):
        for k in st[j]:
            nct[j] += ct[k]
            nct[j] %= mod
    ct = nct[:]
    #print(ct)

print(ct[0])