#include <bits/stdc++.h>

using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
void cmmdc(int,int,int&,int&);
int main()
{
    int a,b,x,y;
    f>>a>>b;
    cmmdc(a,b,x,y);
    x%=b;
    if(x<0)
        x+=b;
    g<<x;
    return 0;
}
void cmmdc(int a,int b,int &x,int &y)
{
    if(b==0)
    {
        x=1;y=0;
        return ;
    }
    int X,Y;
    cmmdc(b,a%b,X,Y);
    x=Y;y=X-(a/b)*Y;
}