#include <fstream>
#define lld long long
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
lld n, p;
void gcd(lld &x, lld &y, int a, int b)
{
    if (!b)
        x = 1, y = 0;
    else
    {
        gcd(x,y,b,a%b);
        lld aux = x;
        x = y;
        y = aux - y*(a/b);
    }
}
int main()
{
    lld v1, v2;
    fin>>n>>p;
    gcd(v1, v2, n, p);
    while (v1<0)v1+=p;
    fout<<v1<<'\n';
    return 0;
}