package main
import "fmt"

func main() {
	var N int
	var M int
	var T int
	fmt.Scan(&N, &M, &T)
	const MOD int = 998244353
	v := make([][2]int, N, N)
	r := make([][]int, N, N)
	for i := 0; i < M; i++ {
		var s int
		var t int
		fmt.Scan(&s, &t)
		r[s] = append(r[s], t)
		r[t] = append(r[t], s)
	}
	v[0][0] = 1
	for t := 0; t < T; t++ {
		for i := 0; i < N; i++ {
			v[i][(t+1) % 2] = 0
			for _, j := range r[i] {
				v[i][(t+1) % 2] = (v[i][(t+1)%2] + v[j][t % 2]) % MOD
			}
		}
	}
	fmt.Println(v[0][T%2])
}