#include <fstream>
#define ll long long
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int a,n;

void cmmdc(ll &x, ll &y, int a, int b)
{
    if (!b)
        x=1,y=0;
    else
    {
        cmmdc(x,y,b,a%b);
        ll aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}
int main()
{
    ll x=0,y;
    f>>a>>n;
    cmmdc(x,y,a,n);
    if (x<=0)
        x=n+x%n;
    g<<x;
    return 0;
}