#include<bits/stdc++.h>

using namespace std;
using ll = long long;


int main()
{
    int n; cin >> n;
    vector<int> a(n);
    for(int i = 0; i < n; i++)cin >> a[i], a[i]--;

    ll ans = 0;
    int cur = 0;
    for(int i = 0; i < n; i++) {
        cur += a[i];
        ans += abs(cur);
    }
    cout << ans << endl;
}