public static void main ( String [ ] args ) {
  int n = 4 ;
  int a1 [ ] = {
    1 , 1 , 0 , 0 };
    System . out . println ( no_of_ways ( a1 , n ) ) ;
    n = 5 ;
    int a2 [ ] = {
      1 , 1 , 1 , 0 , 0 };
      System . out . println ( no_of_ways ( a2 , n ) ) ;
      n = 5 ;
      int a3 [ ] = {
        1 , 1 , 0 , 0 , 0 };
        System . out . println ( no_of_ways ( a3 , n ) ) ;
        n = 6 ;
        int a4 [ ] = {
          1 , 1 , 1 , 0 , 0 , 0 };
          System . out . println ( no_of_ways ( a4 , n ) ) ;
        }
        
public static void main ( String [ ] args ) { int n = 4 ; int a1 [ ] = { 1 , 1 , 0 , 0 } ; System . out . println ( no_of_ways ( a1 , n ) ) ; n = 5 ; int a2 [ ] = { 1 , 1 , 1 , 0 , 0 } ; System . out . println ( no_of_ways ( a2 , n ) ) ; n = 5 ; int a3 [ ] = { 1 , 1 , 0 , 0 , 0 } ; System . out . println ( no_of_ways ( a3 , n ) ) ; n = 6 ; int a4 [ ] = { 1 , 1 , 1 , 0 , 0 , 0 } ; System . out . println ( no_of_ways ( a4 , n ) ) ; }
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