#include <fstream>

using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,m,x0,x1,r,c,x,i,co;
int main()
{
    f>>a>>m;
    x0=1;
    x1=0;
    co=m;
    while(m!=0)
    {
        r=a%m;
        c=a/m;
        a=m;
        m=r;
        x=x0-c*x1;
        x0=x1;
        x1=x;
    }
    if(x0<0)g<<x0+co;
    else g<<x0;
    return 0;
}