#include<iostream>
#include<fstream>
#define LL long long
using namespace std;

int a,n;

void euclid_extins(LL &x,LL &y,int a,int b)
{
    if(!b)
        x = 1,y = 0;
    else
    {
        euclid_extins( x, y, b, a%b);
        LL aux = x;
        x = y;
        y = aux - y *(a / b);
    }
}
int main()
{
    ifstream cin("inversmodular.in");
    ofstream cout("inversmodular.out");
    LL inv = 0,ins;
    cin>>a>>n;
    euclid_extins(inv,ins,a,n);
    if(inv <= 0)
        inv = n +inv % n;
    cout<<inv;
    return 0;
}