/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.*;
 
import static java.util.stream.Collectors.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	interface Customer {
		String getName();
		BigDecimal getSalary();
	}
 
	public static void main (String[] args) throws java.lang.Exception
	{
		Map.Entry<Long, List<Customer>> entry = Map.entry(0L, List.of());
 
		Map<String, BigDecimal> map = entry.getValue().stream()
		        .collect(groupingBy(Customer::getName,
		                reducing(BigDecimal.ZERO, Customer::getSalary, BigDecimal::add)));
 
        System.out.println("Success");
	}
}

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