package main

import (
	"fmt"
	"math"
)

func main() {
	var a, b, mod int
	fmt.Scan(&a, &b)

	mod = int(math.Pow(10, 9)) + 7
	fmt.Println(resolve(a, b, mod))
}

func resolve(a, b, mod int) int {
	if a%2 == b%2 {
		return (((a+1)%mod)*((b+1)%mod) + (a * b % mod)) % mod
	} else {
		return (((a+1)%mod)*(b%mod) + (a%mod)*((b+1)%mod)) % mod
	}
}