#include <fstream>

using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,n,x,y;
void euclid(int a, int b, int &x, int &y)
{
    if(b==0) {x=1;y=0; return ;}
    euclid(b,a%b,x,y);
    int q=a/b;
    int x0=y,y0=x-q*y;
    x=x0;y=y0;
    return ;
}
int main()
{
    f>>a>>n;
    euclid(a,n,x,y);
    while(x>=n) x-=n;
    while(x<=0) x+=n;
    g<<x<<'\n';
    return 0;
}