#include<atcoder/all>
int main(){
	int N;
	scanf("%d",&N);
	std::queue<std::vector<atcoder::modint998244353>> poly;
	for(long long A,i=0;i<N;i++){
		scanf("%lld",&A);
		poly.push({1,A});
	}
	while(poly.size()>1){
	    std::vector<atcoder::modint998244353> bef=move(poly.front());
	    poly.pop();
	    poly.push(atcoder::convolution(bef,poly.front()));
	    poly.pop();
	}
	atcoder::modint998244353 ans=0;
	for(int i=0; i<=N; i++)ans+=(atcoder::modint998244353(i).pow(N-i))*poly.front()[i];
	printf("%d\n",ans.val());
}