#include <iostream>
#include <string>
#include <math.h>

using namespace std;

int main()
{
    int start;
    int stop;
    int magicNumber;

    cin >> start >> stop >> magicNumber;

    int currentNumber = 0;
    int combinations = 0;

    for (int n1 = start; n1 <= stop; n1++)
    {
        for (int n2 = start; n2 <= stop; n2++)
        {
            currentNumber = n1 + n2;
            combinations++;

            if (currentNumber == magicNumber)
            {
                cout << "Combination N:" << combinations << " (" << n2 << " + " << n1 << " = " << currentNumber << ")" << endl;
                return 0;
            }
            break;
        }
    }
    cout << combinations << " combinations - neither equals " << magicNumber << endl;

    return 0;
}