package main

import . "fmt"

func main() {
	var n,m,t int
	Scan(&n,&m,&t)
	g := make([][]int, n)
	for ; m > 0; m-- {
		var u,v int
		Scan(&u,&v)
		g[u] = append(g[u], v)
		g[v] = append(g[v], u)
	}
	xs, ys := make([]int, n), make([]int, n)
	xs[0] = 1
	for i := 0; i < t; i++ {
		for p, es := range g {
			ys[p] = 0
			for _, e := range es {
				ys[p] += xs[e]
				ys[p] %= 998244353
			}
		}
		xs, ys = ys, xs
	}
	Println(xs[0])
}