static long fastPow ( long a , long b , long mod ) {
  if ( b == 0 ) return 1L ;
  long val = fastPow ( a , b / 2 , mod ) ;
  if ( b % 2 == 0 ) return val * val % mod ;
  else return val * val % mod * a % mod ;
}

static long fastPow ( long a , long b , long mod ) { if ( b == 0 ) return 1L ; long val = fastPow ( a , b / 2 , mod ) ; if ( b % 2 == 0 ) return val * val % mod ; else return val * val % mod * a % mod ; }
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