#include <iostream>
#include <fstream>
#include <cmath>
#define LL long long
using namespace std;
void cmmdc(LL &x,LL &y,int a,int b)
{
    if(b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        cmmdc(x,y,b,a%b);
        LL aux=x;
        x=y;
        y=aux - y * ( a / b );
    }
}
int main()
{
    int a,n;
    LL inv=1,y;
    ifstream f("inversmodular.in");
    ofstream g("inversmodular.out");
    f>>a>>n;
    cmmdc(inv,y,a,n);
    if(inv<=0)
        inv=n + inv%n;
    g<<inv;
}