import sys
input = sys.stdin.buffer.readline

def main():
    A,B = map(int,input().split()); MOD = pow(10,9) + 7
    if A <= B:
        ans = 1 + 2*(A+1)*A
    else:
        if A%2 == 1:
            a = 1 + (B//2)*2
            a1 = 2*B + 1 - a
        else:
            a = 1 + (B//2)*2
            a1 = 2*B + 1 - a
            a,a1 = a1,a
        ans = A*a + (A+1)*a1
    print(ans%MOD)

if __name__ == '__main__':
    main()