class LCM{

	public static void main(String args[]){

		long Number1=0,Number3=0;
		long Number2=0,Number4=0;

		long LCM_value,LCM_1_2,LCM_3_4;

		try{// if the user does not enter a number as an argument, catch the error and let the user know what the error is.
		//it is better because the error generated by the compiler could be hard to understand by the users who do not know about the code 
			Number1=Long.parseLong(args[0]);
		 	Number2=Long.parseLong(args[1]);
		 	Number3=Long.parseLong(args[2]);
		 	Number4=Long.parseLong(args[3]);
	
		}catch(Exception e){

			System.out.println("Please give four numbers as arguments");
			System.exit(0);

		}
	
		System.out.println("Numbers entered are "+Number1+", "+Number2+", "+Number3+", "+Number4);
	
		//get the LCM of Number1, Number2. We know LCM(a,b)*gcd(a,b)=a*b;
		LCM_1_2=(Number1/GCD(Number1,Number2))*Number2;
		//get the LCM of Number1, Number2. We know LCM(a,b)*gcd(a,b)=a*b;
		LCM_3_4=(Number3/GCD(Number3,Number4))*Number4;

		//now LCM of the 4 numbers will be LCM of the LCM values of the pairs generated above
		//get the LCM of LCM_1_2, LCM_3_4. We know LCM(a,b)*gcd(a,b)=a*b;
		LCM_value=(LCM_1_2/GCD(LCM_1_2,LCM_3_4))*LCM_3_4;

		//print the final LCM value
		System.out.println("\nLCM is ="+LCM_value);

	}
	//computes GCD of two numbers
	public static long GCD(long number1,long number2){

		long temp,gcd=0;
		//let number1 be the largest of the two numbers
		if(number1<number2){
			temp=number2;
			number2=number1;
			number1=temp;		
		}
		//the maxmimum value of GCD can be, is the value of the smaller number
		//hence keep checking for the maximim number which divides both the numbers, till we reach the smaller number
		for(long i=1;i<=number2;i++){

			if((number1%i==0) && (number2%i==0))
				gcd=i;
		}
	
		return gcd;
	}	
}