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