import java.math.BigInteger;

class Main
{
	public static void main (String[] args)
	{
		System.out.println( binomial(4,2) );
		System.out.println( binomial(133,71) );
	}
	
	static BigInteger binomial(int N, int K) {
	    BigInteger ret = BigInteger.ONE;
	    for (int k = 0; k < K; k++) {
	        ret = ret.multiply(BigInteger.valueOf(N-k))
	                 .divide(BigInteger.valueOf(k+1));
	    }
	    return ret;
	}
}