public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int a = sc . nextInt ( ) ;
  int b = sc . nextInt ( ) ;
  int c = sc . nextInt ( ) ;
  int d = sc . nextInt ( ) ;
  int A = a , B = b , C = c , D = d ;
  int num , p , q ;
  if ( c > d ) {
    num = lcm ( c , a ) ;
    b = b * ( num / a ) ;
    a = num ;
    d = d * ( num / c ) ;
    c = num ;
    p = ( b - d ) ;
    q = b ;
    if ( b < d ) {
      a = A ;
      b = B ;
      c = C ;
      d = D ;
      num = lcm ( d , b ) ;
      a = a * ( num / b ) ;
      b = num ;
      c = c * ( num / d ) ;
      d = num ;
      p = ( a - c ) ;
      q = a ;
    }
  }
  else {
    num = lcm ( d , b ) ;
    a = a * ( num / b ) ;
    b = num ;
    c = c * ( num / d ) ;
    d = num ;
    p = ( a - c ) ;
    q = a ;
    if ( a < c ) {
      a = A ;
      b = B ;
      c = C ;
      d = D ;
      num = lcm ( c , a ) ;
      b = b * ( num / a ) ;
      a = num ;
      d = d * ( num / c ) ;
      c = num ;
      p = ( b - d ) ;
      q = b ;
    }
  }
  if ( p == 0 ) {
    q = 1 ;
  };
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int a = sc . nextInt ( ) ; int b = sc . nextInt ( ) ; int c = sc . nextInt ( ) ; int d = sc . nextInt ( ) ; int A = a , B = b , C = c , D = d ; int num , p , q ; if ( c > d ) { num = lcm ( c , a ) ; b = b * ( num / a ) ; a = num ; d = d * ( num / c ) ; c = num ; p = ( b - d ) ; q = b ; if ( b < d ) { a = A ; b = B ; c = C ; d = D ; num = lcm ( d , b ) ; a = a * ( num / b ) ; b = num ; c = c * ( num / d ) ; d = num ; p = ( a - c ) ; q = a ; } } else { num = lcm ( d , b ) ; a = a * ( num / b ) ; b = num ; c = c * ( num / d ) ; d = num ; p = ( a - c ) ; q = a ; if ( a < c ) { a = A ; b = B ; c = C ; d = D ; num = lcm ( c , a ) ; b = b * ( num / a ) ; a = num ; d = d * ( num / c ) ; c = num ; p = ( b - d ) ; q = b ; } } if ( p == 0 ) { q = 1 ; } ; }
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