Uva 10925 - Krakovia

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import java.util.*;
import  java.math.*;

class Main
{
    public static void main (String[] args)
    {
        Scanner in = new Scanner(System.in);
       
        int n , f, tc=0;
       
        while(in.hasNext())
        {
            n = in.nextInt();
            f = in.nextInt();
           
            if(n==0 && f==0) break;
           
            BigInteger total = BigInteger.valueOf(0);
            BigInteger v;
           
            for(int i=0; i<n; i++)
            {
                v = in.nextBigInteger();
               
                total = total.add(v);
            }
           
            System.out.println("Bill" + " #" + (++tc) + " costs " + total + ": " + "each friend should pay " + (total.divide(BigInteger.valueOf(f))));
            System.out.print("\n");
        }
    }
}

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