public class Matrice
{

    static public int[][] mult(int m1[][],
			       int m2[][])
	throws Exception
    {

	if ( m1[0].length != m2.length )
	    throw new Exception("ratai");

	int r[][] = new int[m1.length][m2[0].length];

	for(int i=0; i<m1.length; i++)
	    for(int j=0; j<m2[0].length; j++)
		for(int k=0; k<m1[0].length; k++)
		    r[i][j] += m1[i][k] * m2[k][j];

	return r;
    }

}