#include "combinatorics.h"
#include <stdio.h>

void swap(largeint* a, largeint* b)
{
	largeint a_copy = *a;
	*a = *b;
	*b = a_copy;
}

int main()
{
	largeint n = 0, r = 0;
	while ( scanf("%llu %llu", &n, &r) != EOF )
	{
		if ( r > n )
		{
			swap(&n, &r);
			printf("Did you mean? ");
		}
		printf("C(%llu,%llu) = %llu\n", n, r, combinations(n, r) );
	}

	return 0;
}