import sys
#input = sys.stdin.readline
#input = sys.stdin.buffer.readline


def main():
    N,M,T = map(int,input().split()); MOD = 998244353
    G =[[] for _ in range(N)]
    for i in range(M):
        a,b = map(int,input().split())
        G[a].append(b)
        G[b].append(a)
    
    dp = [0]*N
    dp[0] = 1
    for i in range(T):
        p = [0]*N
        p,dp = dp,p
        for v in range(N):
            for u in G[v]:
                dp[v] += p[u]
                dp[v] %= MOD
    ans = dp[0]%MOD
    print(ans)
        

if __name__ == '__main__':
    main()