public static long multiply ( long a , long b , long c ) {
  long res = 0 ;
  a %= c ;
  while ( b > 0 ) {
    if ( b % 2 == 1 ) {
      res = ( res + a ) % c ;
    }
    a = ( a + a ) % c ;
    b /= 2 ;
  }
  return res % c ;
}

public static long multiply ( long a , long b , long c ) { long res = 0 ; a %= c ; while ( b > 0 ) { if ( b % 2 == 1 ) { res = ( res + a ) % c ; } a = ( a + a ) % c ; b /= 2 ; } return res % c ; }
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