#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream fin("inversmodular.in");
    ofstream fout("inversmodular.out");
    int r,a,n,x,y,c[100],k=0,x0,y0;
    fin>>a>>n;
    x=a;y=n;
    while(y)
    {
        r=x%y;
        c[++k]=x/y;
        x=y;
        y=r;
    }
    x0=1;y0=0;
    while(k)
    {
        x=y0;
        y=x0-c[k--]*y0;
        x0=x;
        y0=y;
    }
    while(x0<0)x0+=n;
    fout<<x0%n;
    return 0;
}