#include<fstream>
using namespace std;
ifstream in("inversmodular.in");
ofstream out("inversmodular.out");
#define ll long long

ll A,N,X,Y;

void euclid(int a,int b,ll &x,ll &y){

    if(!b){
        x = 1;
        y = 0;
    }
    else{
        euclid(b,a % b,x,y);
        ll aux = x;
        x = y;
        y = aux - y*(a/b);
    }
}

int main()
{

    in>>A>>N;
    euclid(A,N,X,Y);
    if(X <= 0)
        X = N + X % N;
    out<<X;
    return 0;
}