#include <fstream>

using namespace std;
int a,n,inv,ins;

ifstream cin("inversmodular.in");
ofstream cout("inversmodular.out");

void solve(int &x, int &y, int a, int b)
{
    if (b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        solve(x,y,b,a%b);
        int aux=x;
        x=y;
        y=aux-x*(a/b);
    }
}

int main()
{
    cin>>a>>n;
    solve(inv,ins,a,n);
    if (inv<=0) inv=n+inv%n;
    cout<<inv;
}