public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  long a = sc . nextLong ( ) ;
  long b = sc . nextLong ( ) ;
  long x = sc . nextLong ( ) ;
  long y = sc . nextLong ( ) ;
  long c = 0 ;
  long gcd = gcd ( x , y ) ;
  x = x / gcd ;
  y = y / gcd ;
  long a1 = a / x ;
  long a2 = b / y ;
  System . out . println ( Math . min ( a1 , a2 ) ) ;
  ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; long a = sc . nextLong ( ) ; long b = sc . nextLong ( ) ; long x = sc . nextLong ( ) ; long y = sc . nextLong ( ) ; long c = 0 ; long gcd = gcd ( x , y ) ; x = x / gcd ; y = y / gcd ; long a1 = a / x ; long a2 = b / y ; System . out . println ( Math . min ( a1 , a2 ) ) ; ; }
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