static int power ( int F [ ] [ ] , int n ) {
  int M [ ] [ ] = {
    {
      1 , 1 , 1 }, {
        1 , 0 , 0 }, {
          0 , 1 , 0 }
        };
        if ( n == 1 ) return F [ 0 ] [ 0 ] + F [ 0 ] [ 1 ] ;
        power ( F , n / 2 ) ;
        multiply ( F , F ) ;
        if ( n % 2 != 0 ) multiply ( F , M ) ;
        return F [ 0 ] [ 0 ] + F [ 0 ] [ 1 ] ;
      }
      
static int power ( int F [ ] [ ] , int n ) { int M [ ] [ ] = { { 1 , 1 , 1 } , { 1 , 0 , 0 } , { 0 , 1 , 0 } } ; if ( n == 1 ) return F [ 0 ] [ 0 ] + F [ 0 ] [ 1 ] ; power ( F , n / 2 ) ; multiply ( F , F ) ; if ( n % 2 != 0 ) multiply ( F , M ) ; return F [ 0 ] [ 0 ] + F [ 0 ] [ 1 ] ; }
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