//
//  main.cpp
//  ec330
//
//  Created by Aidar Baggio on 1/28/15.
//  Copyright (c) 2015 Aidar Baggio. All rights reserved.
//

#include <iostream>
#include <iomanip>
#include <cmath>
#include <cstdlib>
#include <limits.h>
#include <algorithm>


using namespace std;

int min_sum (int *nums, int len);

int main(){
    int len;
    cin >> len;
    int nums[len];

    for (int i = 0; i<len; i++){
        cin >> nums[i];
    }
    cout << "\n";
    cout << min_sum(nums, len) << endl;
    return 0;
}


int min_sum(int *nums, int len) {
    int min = abs(nums[0] - 330);

    for (int i=0;i<=len;++i)
        for (int j=i+1;j<=len+1;++j)
            for (int k=j+1;k<=len+2;++k){
                int s = nums[i];
                if (j < len) s += num[j];
                if (k < len) s += num[k];
                if (abs(s - 330) < min){
                    min = s;
                }
            }
    return min;
}