static long gcdPow ( long a , long n , long c ) {
  if ( a % c == 0 ) return c ;
  long modexpo = modPower ( a , n , c ) ;
  return gcd ( modexpo , c ) ;
}

static long gcdPow ( long a , long n , long c ) { if ( a % c == 0 ) return c ; long modexpo = modPower ( a , n , c ) ; return gcd ( modexpo , c ) ; }
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