import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)
mod = 998244353


N, M, T = map(int, input().split())
G = [[] for _ in range(N)]
for _ in range(M):
    a, b = map(int, input().split())
    G[a].append(b)
    G[b].append(a)

dp = [0] * N
dp[0] = 1
for _ in range(T):
    ndp = [0] * N
    for i in range(N):
        for j in G[i]:
            ndp[i] += dp[j]
        ndp[i] %= mod
    dp = ndp
print(dp[0])