#include <iostream>
#include <cstdio>
using namespace std;

int euclid(int a, int b,int &x,int &y)
{
    if(b==0)
        return a;
    int r = a%b;
    int cmmdc = euclid(b,r,x,y);
    int c = a/b;
    int x_prec=x,y_prec=y;
    x = y_prec;
    y = x_prec - c*y_prec;
    return cmmdc;

}

void solve(int a,int b,int c)
{
    int x=1,y=0;
    int d = euclid(a,b,x,y);
    if(c%d)
    {
        printf("0");
        return;
    }
    int div = c / d;
    printf("%d",x*div);

}

int main()
{
    freopen("inversmodular.in","r",stdin);
    freopen("inversmodular.out","w",stdout);
    int A,N;
    scanf("%d%d",&A,&N);
    solve(A,N,1);
    return 0;
}