Kertotaulu

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


public class Main {
	
	public static BigInteger summa(long n) {
		BigInteger b = new BigInteger(String.valueOf(n));
		return b.multiply(b.add(BigInteger.ONE)).divide(BigInteger.ONE.add(BigInteger.ONE));
	}
	
	public static BigInteger erotus(long n, long m) {
		return summa(m).subtract(summa(n-1));
		
	}

	public static void main(String[] args) {
		Scanner lukija = new Scanner(System.in);
		long y1 = lukija.nextLong();
		long x1 = lukija.nextLong();
		long y2 = lukija.nextLong();
		long x2 = lukija.nextLong();
		
		BigInteger a = erotus(y1, y2);
		BigInteger b = erotus(x1, x2);
		
		BigInteger n = a.multiply(b).mod(new BigInteger("1000000007"));
		System.out.println(n);
		lukija.close();
	}

}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED