#include<fstream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

void gcd(int a, int b, int &x, int &y){

    if(b == 0){

        x = 1;
        y = 0;
    }
    else{

        int x0, y0;
        gcd(b, a % b, x0, y0);
        x = y0;
        y = x0 - (a / b) * y0;
    }
}

int main(){

    int A, N;
    fin >>A >> N;

    int x, y;
    gcd(A, N, x, y);

    while(x <= 0)
        x += N;
    fout << x;
}