static long modPow ( long a , long b , long mod ) {
  long res = 1 ;
  long c = a ;
  while ( b > 0 ) {
    if ( b % 2 == 1 ) res = res * c % mod ;
    c = c * c % mod ;
    b /= 2 ;
  }
  return res ;
}

static long modPow ( long a , long b , long mod ) { long res = 1 ; long c = a ; while ( b > 0 ) { if ( b % 2 == 1 ) res = res * c % mod ; c = c * c % mod ; b /= 2 ; } return res ; }
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