import sys
input = sys.stdin.buffer.readline

def main():
    A,B = map(int,input().split()); MOD = pow(10,9) + 7
    if B%2 == 0:
        #スタートB+1
        x = ((A+1)//2)*2
        y = (A//2)*2 + 1
        ans = x*B + y*(B+1)
    else:
        #スタートがB
        x = ((A+1)//2)*2
        y = (A//2)*2 + 1
        ans = x*(B+1) + y*B
    print(ans%MOD)

if __name__ == '__main__':
    main()