#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
void gcd(long long &x,long long &y,int a,int b)
{
    if(b==0)
    {
        x = 1;
        y = 0;
    }
    else
    {
        gcd(x,y,b,a%b);
        int aux = x;
        x = y;
        y = aux - (a/b)*y;
    }
}
int main()
{
    long long x,y;
    int a,n;
    fin>>a>>n;
    gcd(x,y,a,n);
    if(x<=0)
        x = n + x%n;
    fout<<x;
    return 0;
}