#include <iostream>
#include <fstream>
using namespace std;
int n, p, x, y, nr;
void ex(int a,int b,int &x,int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        ex(b,a%b,x,y);
        nr=x;
        x=y;
        y=nr-(a/b)*y;
    }
}
int main()
{
    ifstream cin("inversmodular.in");
    ofstream cout("inversmodular.out");
    cin>>n>>p;
    ex(n,p,x,y);
    if(x<=0)
        x=p+x%p;
    cout<<x;
    return 0;
}