#include <fstream>
 
using namespace std;
 
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
 
int a,n;
 
void gcd(long long &x,long long &y,int a,int b)
{
    if(b==0)
        x=1,y=0;
    else
    {
        gcd(x,y,b,a%b);
        long long aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}
 
int main()
{
    long long inv=0, ins;
    fin>>a>>n;
    gcd(inv, ins,a,n);
    if(inv<=0)inv=n+inv%n;
    fout<<inv;
    return 0;
}