#include<bits/stdc++.h>
using namespace std;
int main()
{
    unsigned long long n,k,sum=1;
    cin>>n>>k;
    for(int i=0;i<k;i++)
    {
        unsigned long long temp=(unsigned long long)pow((n-i),2)%504;
        sum*=temp;
        sum%=504; 
    }
    cout<<sum<<endl;
    return 0;
}