#include <stdio.h>
#include <algorithm>

using namespace std ;

int main(int argc, char* argv[])
{
        int N ;
        long i ;
        double inta[100001];
        long sum1 , sum2 ;
        while(scanf("%d",&N)!=EOF)
        {
                for( i = 0 ;i < N ; i ++)
                        scanf("%lf",&inta[i] ) ;
                sort(inta , inta + N);
                sum1 = inta[N-1] ;
                sum2 = inta[N-2] ;
                for( i = N-3 ; i>=0 ;i--)
                {
                      if( sum1 >= sum2 )
                      {
                        sum2 += inta[i] ;
                      }
                      else
                        sum1 += inta[i] ;
                }
                printf("%ld\n",abs(sum1-sum2) );
        }
        return 0;
}
//---------------------------------------------------------------------------

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2
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2

answer 0