#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,n,x,y;
    f>>a>>n;
    cmmdc(a,n,x,y);
    x%=n;
    if(x<0)x+=n;
    g<<x;
    return 0;
}
void cmmdc(int a,int b,int &x,int &y)
{
    if(!b){x=1;y=0;return;}
    int X,Y;
    cmmdc(b,a%b,X,Y);
    x=Y;
    y=X-a/b*Y;
}