#include <fstream>

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