#include<bits/stdc++.h>
using namespace std;

int main() {
	int n,x,s = 0;
	cin>>x;
	cin>>n;
	for(int i = 1;i <= n;i++){
		int t;
		cin>>t;
		s = s + t;
	}
	
	cout<<s * x;
	
	return 0;
}

/**************************************************************
	Problem: 2087
	User: admin
	Language: C++
	Result: Accepted
	Time:46 ms
	Memory:2072 kb
****************************************************************/