#include "bits/stdc++.h"

#define REP(i, n) for(decltype(n) i = 0; i < (n); i++)
#define REP2(i, x, n) for(decltype(x) i = (x); i < (n); i++)
#define RREP(i, n) for (decltype(n) i = (n) - 1;i >= 0; i--)

#define ALL(a) (a).begin(),(a).end()
#define SORT(c) sort((c).begin(),(c).end())
#define DESCSORT(c) sort(c.begin(), c.end(), greater<int>())

#define LL long long int
#define LD long double

#define PI 3.14159265358979

#define _CRT_SECURE_NO_WARNINGS

using namespace std;

//================================================

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);

	int N;
	cin >> N;
	vector<int>vec(N);

	int sum = 0;
	REP(i, N) { cin >> vec[i]; sum += vec[i]; };
	int sqrtSum = (int)sqrt(sum);
	
	int ans = 0;
	REP(i, N) ans += max(0, vec[i] - max(0, sqrtSum - abs((sqrtSum - 1) - i)));
	cout << ans << "\n";
	return 0;
}