#include <iostream>
#include <vector>
#include <cmath>
using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int> A(N);
    int sum = 0;
    for (int i = 0; i < N; ++i) {
        cin >> A[i];
        sum += A[i];
    }

    int sump = (int)sqrt(sum) * (int)sqrt(sum);
    int M = (int)sqrt(sump) * 2 - 1;
    vector<int> B(M);
    for (int i = 0; i < M; ++i) {
        if (i < M / 2) {
            B[i] = i + 1;
        } else {
            B[i] = M - i;
        }
    }
    
    int res = 0;
    for (int i = 0; i < max(M, N); ++i) {
        if (i < M && i < N) {
            res += abs(A[i] - B[i]);
        } else if (i < M) {
            res += B[i];
        } else {
            res += A[i];
        }
    }
    // 初項：移動　次項：除去
    cout << (res - (sum - sump)) / 2 + sum - sump << endl;
}