#include <fstream>

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