#include <iostream>
#include <fstream>

using namespace std;

ifstream f("inversmodular.in");
ofstream g("inversmodular.out");

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 InversModular(int a,int b){
    int d,x,y;
    EuclidExtins(a,b,d,x,y);
    while(x<0) x+=b;
    return x;
}

int main()
{
    int A,N;
    f >> A >> N;
    g << InversModular(A,N);
    f.close();
    g.close();
    return 0;
}