/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	}
}

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| a b stdout |
stdout := FileStream stdout.
FileStream stdin
	linesDo: [ :line |
		line isEmpty ifFalse: [
			(a isNil)
				ifTrue: [ a := line asNumber ]
				ifFalse: [ b := line asNumber ]
		]
	].

stdout
	nextPutAll: '和: '; nextPutAll: (a + b) printString; nl;
	nextPutAll: '差: '; nextPutAll: (a - b) printString; nl;
	nextPutAll: '積: '; nextPutAll: (a * b) printString; nl.

b = 0
	ifTrue: [
		stdout nextPutAll: 'ゼロで割ろうとしています'; nl
	]
	ifFalse: [
		stdout
			nextPutAll: '商: '; nextPutAll: (a / b) printString; nl;
			nextPutAll: '剰余: '; nextPutAll: (a \\ b) printString; nl.
	].

stdout flush.