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

#define rep(i, n) for( ll i = 0; i < n; i++ )
using ll = long long;

int main() {
	int N;
	cin >> N;
	if(N < 1 || 100 < N) return 0;
	vector<int> a(N);
	rep(i, N) {
		cin >> a[i];
		if(a[i] < 1 || 100 < a[i]) return 0;
	}
	ll ans = 0;
	rep(i, N) rep(j, N) {
		ans += abs(i - j) * abs(a[i] - a[j]);
	}
	cout << ans << endl;
}