#include <fstream>

using namespace std;

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

int n,m,x,y;

void gcdE(int a,int b,int &i,int &j)
{
    if(!b)
        i=1, j=1;
    else
    {
        int i0,j0;
        gcdE(b,a%b,i0,j0);

        i=j0;
        j=i0-(a/b)*j0;
    }
}

int main()
{
    fin>>m>>m;
    gcdE(n,m,x,y);
    while(x<0)
        x+=m;
    fout<<x<<'\n';
    return 0;
}