#include <fstream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

void gcd(int a,int b,long long &x,long long &y)
{
    if(!b)
    {
        x=1;
        y=0;
    }
    else
    {
        gcd(b,a%b,x,y);
        int au=x;
        x=y;
        y=au-(a/b)*y;
    }
}

int main()
{
    long long x=0,y;
    int n,p;
    fin>>n>>p;
    gcd(n,p,x,y);
    if(x<0)
        x=x+x%p;
    fout<<x;
}