#include <bits/stdc++.h>

using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
void cmmdc( int a, int b, int &x, int &y)
{
    if(b==0)
    {
        x=1;
        y=0;

    }
    else
    {
        int x0,y0;
        cmmdc(b,a%b,x0,y0);
        x=y0;
        y=x0-a/b*y0;
    }
}
int main()
{
    int n,a,x,y;
    fin>>a>>n;

    cmmdc(a,n,x,y);
    if(x>=0)
        fout<<x;
    else fout<<n+x;
    return 0;
}