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

void gcd(long long &i1,long long &i2,int a,int b)
{
    if(!b)
    {
        i1=1;
        i2=0;
    }
    else
    {
        gcd(i1,i2,b,a%b);
        long long aux=i1;
        i1=i2;
        i2=aux-i2*(a/b);
    }
}

int main()
{
    int n,p;
    long long i1=0,i2;
    fin>>n>>p;
    gcd(i1,i2,n,p);
    if(i1<0)i1=p+i1%p;
    fout<<i1;
    return 0;
}