HDU 1002 -- A+B problemII (Java)

import java.math.*;//BigInteger
import java.util.*;//Scanner

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int t=in.nextInt();
		for(int i=1;i<=t;i++){
			if(i!=1)
				System.out.println();
			BigInteger a=in.nextBigInteger();
			BigInteger b=in.nextBigInteger();
			System.out.println("Case "+i+":");
			System.out.println(a+" + "+b+" = "+a.add(b));
		}

	}

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