import std.stdio, std.array, std.string, std.conv, std.algorithm;
import std.typecons, std.range, std.random, std.math, std.container;
import std.numeric, std.bigint, core.bitop, std.bitmanip;

immutable long MOD = 10^^9 + 7;

void main() {
    auto s = readln.split.map!(to!long);
    auto N = s[0];
    auto M = s[1];
    auto X = N / M;

    if (X <= 1) {
        writeln(0);
        return;
    }

    long ans = X * (X - 1) % MOD;
    auto table = new bool[](N+1);

    for (long i = M * 2; i <= N; i += M) {
        if (table[i]) continue;
        ans -= 1L * (N / i) * (N / i - 1) % MOD;
        ans %= MOD;
        for (long j = i * 2; j <= N; j += i) {
            table[j] = true;
        }
    }

    foreach (i; 1..N-1) {
        ans = ans * i % MOD;
    }
    ans = (ans + MOD) % MOD;

    ans.writeln;
}