combinacao

#include <iostream>
#include <sstream>

using namespace std;

int SIZE = 0;

void pnums(int size, int from, int to, string curr)
{
    if (size == 0)
    {
        //cout << curr << endl;
        SIZE++;
    }
    else
    {
        for (int i = from; i <= to; i++)
        {
            ostringstream conv; conv << curr << i << " ";
            pnums(size - 1, i + 1, to, conv.str());
        }
    }
}

int  main()
{
    int size, from, to;
    cin >> size >> from >> to;
    pnums(size, from, to, "");
    cout << endl << SIZE << endl;
    return 0;
}