#include <bits/stdc++.h>

int main() {
    int n; std::cin >> n;
    std::vector<int> a(n + 1);
    for (int i = 1; i <= n; ++i)
        std::cin >> a[i];
    int res = 0;
    for (int i = 1; i <= n; ++i)
        for (int j = 1; j <= n; ++j)
            res += std::abs(j - i) * std::abs(a[i] - a[j]);
    std::cout << res << "\n";
    return 0;
}