#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: linmiaoling
	Language: C++
	Result: Accepted
	Time:51 ms
	Memory:2072 kb
****************************************************************/