#include <fstream>
using namespace std;
void euclid(int a,int b,int &x,int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        int x0,y0;
        euclid(b,a%b,x0,y0);
        x=y0;
        y=x0-a/b*y0;
    }
}
int inv(int a,int mod)
{
    int y,x;
    euclid(a,mod,x,y);
    if(x<0)
        x+=mod;
    return x;
}
ifstream cin("inversmodular.in");ofstream cout("inversmodular.out");
int main()
{
    int a,b;
    cin>>a>>b;
    cout<<inv(a,b);
    return 0;
}