bb

number_begining = int(input())
number_end = int(input())
magic_number = int(input())
is_equal = False
counter = 0
for number1 in range(number_begining, number_end + 1):
    for number2 in range(number_begining, number_end + 1):
        counter += 1
        if number1 + number2 == magic_number:
            is_equal = True
            print(f"Combination N:{counter} ({number1} + {number2} = {magic_number})")
            break
    if is_equal:
        break

if not is_equal:
    print(f"{counter} combinations - neither equals {magic_number}")