#include <bits/stdc++.h>

using namespace std;

ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

int cmmdc(int a, int b, int &x, int &y)
{
    if(b==0)
    {
        x=1;
        y=0;
        return a;
    }
    else
    {
        int d, x0, y0;
        d=cmmdc(b, a%b, x0, y0);
        x=y0;
        y=x0-(a/b)*y0;
        return d;
    }
}
int main()
{
    int a, n, x, y, d;
    fin>>a>>n;
    d=cmmdc(a, n, x, y);
    while(x<0)
        x+=n;
    fout<<x<<'\n';
}