beginning_of_interval = int(input())
end_of_interval = int(input())
magic_number = int(input())

combination_sequence = 0
sum_of_two_numbers = 0
combination_found = False

for x1 in range(beginning_of_interval, end_of_interval):
    for x2 in range(beginning_of_interval, end_of_interval):
        sum_of_two_numbers = x1 + x2
        combination_sequence += 1
        if sum_of_two_numbers == magic_number:
            combination_found = True
            break
    break
if combination_found:
    print(f"Combination : N:{combination_sequence}")
    print(f"({x1} + {x2} = {magic_number})")
if sum_of_two_numbers != magic_number:
    print(f"{combination_sequence} combinations - neither equals {magic_number}")