public static long func ( long a , long x ) {
  if ( x == 0 ) return 1 ;
  if ( x % 2 == 0 ) {
    long t = func ( a , x / 2 ) ;
    return ( t * t ) % MOD ;
  }
  long t = func ( a , ( x - 1 ) / 2 ) ;
  t = ( t * t ) % MOD ;
  return ( t * a ) % MOD ;
}

public static long func ( long a , long x ) { if ( x == 0 ) return 1 ; if ( x % 2 == 0 ) { long t = func ( a , x / 2 ) ; return ( t * t ) % MOD ; } long t = func ( a , ( x - 1 ) / 2 ) ; t = ( t * t ) % MOD ; return ( t * a ) % MOD ; }
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