$rt$

#include <iostream>
using namespace std;
int main() {
	long long n, x;
	cin >> n >> x;
	long long t = x;
	long long r = 0;
	for (long long i = 0; i < n; ++i) {
		long long ai;
		cin >> ai;
		r += t + ai;
		t += ai;
	}
	cout << r <<  endl;
	return 0;
}

？ 错那里了QwQ