N,M,T = map(int,input().split())
edge = []
for _ in range(M):
    s,t = map(int,input().split())
    edge.append((s,t))

dp = [0] * N
dp[0] = 1
P = 998244353
for _ in range(T):
    nx = [0] * N
    for s,t in edge:
        nx[t] += dp[s]
        nx[s] += dp[t]
    for i in range(N):
        nx[i] %= P
    dp = nx
print(dp[0])