#include <iostream>
#include <fstream>
using namespace std;
void EuclidExtins(int a, int b, int &d, int &x, int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
        d=a;
    }
    else
    {
        int x0,y0;
        EuclidExtins(b,a%b,d,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
    }
}
int inversMOD(int a,int n){
    int d,x,y;
    EuclidExtins(a,n,d,x,y);
    while(x<0)x+=n;
    return x;}
int main()
{
    int a,n;
    ifstream fin("inversmodular.in");
    ofstream gout("inversmodular.out");
    fin>>a>>n;
    gout<<inversMOD(a,n);
    fin.close();
    gout.close();
    return 0;
}