#include <iostream>
#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
void func(int64_t a,int64_t b,int64_t &x,int64_t &y)
{
    if(!b)
    {
        x=1;
        y=0;
    return;
    }
    else
    {
        int64_t x0,y0;
        func(b,a%b,x0,y0);
        x=y0;
        y=x0-y0*(a/b);
    }
}
int64_t invers(int64_t p,int64_t m)
{
    int64_t x=0,y=0;
    func(p,m,x,y);
    while(x<0)
        x+=m;
    return x;
}
int main()
{
    int64_t x,p;
    f>>x>>p;
    g<<invers(x,p);
}