import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.BigInteger; 
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
	java.util.function.UnaryOperator<BigInteger> squareRootFunction = (inputData) -> {
		BigInteger squareRoot1 =  inputData.divide(BigInteger.valueOf(2L));
		do {
			BigInteger squareRoot2 =  squareRoot1;
			squareRoot1 = inputData.divide(squareRoot2).add(squareRoot2).divide(BigInteger.valueOf(2L));
			if(squareRoot1.compareTo(squareRoot2) == 0) return squareRoot1;
		} while(true);
	};
 
		BigInteger inputData = new BigInteger("1234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012");
		System.out.println(inputData);
		BigInteger 平方根 = squareRootFunction.apply(inputData); 
		System.out.println(平方根);
		BigInteger 検算値 = inputData.divide(squareRootFunction.apply(inputData));
		System.out.println(検算値.multiply(検算値));
		System.out.println(検算値.multiply(平方根));
	}
}

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