import sys
input = sys.stdin.readline

N,M,T=map(int,input().split())
mod=998244353

DP=[0]*N
DP[0]=1

E=[[] for i in range(N)]
for i in range(M):
    s,t=map(int,input().split())
    E[s].append(t)
    E[t].append(s)
    
for i in range(T):
    NDP=[0]*N

    for j in range(N):
        x=0
        for to in E[j]:
            x+=DP[to]
        NDP[j]=x%mod

    DP=NDP

print(DP[0])