N,M,T = map(int, input().split())
mod = 998244353
L = [[] for i in range(N)]
for i in range(M):
    a,b = map(int, input().split())
    L[a].append(b)
    L[b].append(a)
DP = [0] * N
DP[0] = 1
for i in range(T):
    NDP = [0]*N
    for j in range(N):
        for l in L[j]:
            NDP[l]=(DP[j]+NDP[l])%mod
    DP=NDP
print(DP[0])