#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out"); 
void euclid(int a, int b, int &d, int &x, int &y){
    if(b == 0){
        d = a;
        x = 1;
        y = 0;
    }
    else{
        int x0, y0;
        euclid(b, a % b, d, x0, y0);
        x = y0;
        y = x0 - (a / b) * y0;
    }
}
int modinv(int a, int n){
    int x, y, d;
    euclid(a, n, d, x, y);
    while(x < 0)
      x += n;
    return x;
}
int main(){
    int a, n;
    fin >> a >> n;
    fout << modinv(a, n);
    fin.close();
    fout.close();
    return 0;
}