n,m,T = map(int, input().split())
l = [[0] * n for _ in range(n)]
for i in range(m):
    s,t = map(int, input().split())
    l[s][t]=1
    l[t][s]=1
rui = [[0] * n]
rui[0][0] = 1
mod = 998244353
def cal(mat_a, mat_b,r,c):
    new_mat = [[0]*c for _ in range(r)]
    for i in range(r):
        for j in range(c):
            new_mat[i][j] = sum(mat_a[i][w]*mat_b[w][j] % mod for w in range(c)) % mod
    return new_mat

while T:
    if T & 1:
        rui = cal(rui,l,1,n)
    l = cal(l,l,n,n)
    T >>= 1

print(rui[0][0])