#define MD 998244353
int@n,@(a,b)--[n-1];
graph g;
g.setEdge(n,n-1,a,b);
Mint z;
rep(i,n){
	z+=Mint(2)**g.es[i];
	int k=0;
	rep[g.edge[i]](j,g.es[i]){
		k|=g.es[j]>1;
	}
	z-=k?0:2;
}
wt(z);