N,M,T = map(int,input().split())
mod = 998244353
L = [[]for i in range(N)]

for i in range(M):
    s,t = map(int,input().split())
    L[s].append(t)
    L[t].append(s)
    
ans = [0 for i in range(N)]
ans[0] = 1
for i in range(T):
    l = [0 for i in range(N)]
    for j in range(N):
        for k in L[j]:
            l[j] += ans[k]
        l[j] %= mod
    ans = l
print(ans[0]%mod)