using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        const int N = 5, K = 3;

        // 1 represents +, 0 represents -
        var results =
            Enumerable.Range(0, 1 << N)
                .Select(bits =>
                {
                    var permutation =
                        Enumerable.Range(0, N)
                            .Select(n => ((bits & (1 << n)) != 0) ? (n + 1) : -(n + 1))
                            .ToList();

                    var sum = permutation.Sum();
                    var str = string.Join(" + ", permutation);

                    return new {sum, str};
                })
                .Where(intermediate => intermediate.sum == K)
                .Select(intermediate => $"{intermediate.str} = {K}");

        Console.WriteLine(string.Join("\n", results));
    }
}