#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;


int main()
{
    int n,i,j,k;
    while(cin>>n)
    {
        int arr[n+5];
        for(i=0;i<n;i++)
        {
            cin>>arr[i];
        }
        sort(arr,arr+n);
        int res=0,sum=0,x,y;
        for(i=0;i<n;i+=2)
        {
            x=abs(arr[i]-arr[i+1]);
            y=abs(24-x);
            sum+=(min(x,y));
        }
        if(sum<=24-sum)
        cout<<sum<<endl;
        else
        cout<<24-sum<<endl;
    }
    return 0;
}