#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  int n;
  cin >> n;
  vector<int> a(n);
  rep(i, n) cin >> a[i];
  queue<int> balls;
  rep(i, n) rep(_, a[i]) balls.push(i);
  ll ans = 0;
  rep(i, n) {
    assert(!balls.empty());
    ans += abs(balls.front() - i);
    balls.pop();
  }
  cout << ans << '\n';
  return 0;
}