static int spoctiNuly( double[][] d ) {
     int c = 0;
     for( int i = 0; i < d.length; i++ ) {
        for( int j = 0; j < d[i].length; j++ ) {
           if( d[i][j] == 0 ) {
              c++;
           }
        }
     }
     return c;
  }