#include <iostream>
#include <fstream>
#define int long long
using namespace std;
int32_t main()
{
    ifstream cin("inversmodular.in");
    ofstream cout("inversmodular.out");
    int a,b;
    cin>>a>>b;
    for(int i=0;i<b;i++)
    {
        if(a*i%b==1)
        {
            cout<<i;
            break;
        }
    }


    return 0;
}