public static long power ( long a , long b , long m ) {
  long res = 1l ;
  while ( b > 0l ) {
    if ( b % 2l != 0l ) {
      res = ( res % m * a % m ) % m ;
    }
    b = b / 2l ;
    a = ( a % m * a % m ) % m ;
  }
  return res ;
}

public static long power ( long a , long b , long m ) { long res = 1l ; while ( b > 0l ) { if ( b % 2l != 0l ) { res = ( res % m * a % m ) % m ; } b = b / 2l ; a = ( a % m * a % m ) % m ; } return res ; }
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