Calculate the value of the sum: n mod 1 + n mod 2 + n mod 3 + ... + n mod m. As the result can be very large, you should print the value modulo 109+7 (the remainder when divided by 109+7).

The modulo operator a mod b stands for the remainder after dividing a by b. For example 10 mod 3 = 1.

The only line contains two integers n,m (1 \le n,m \le 1013) - the parameters of the sum.

Print integer s - the value of the required sum modulo 109+7.