#include <iostream>
#include <fstream>

using namespace std;
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 main()
{
    ifstream in("inversmodular.in");
    ofstream out("inversmodular.out");
    int n, a, b, c, x, y, i, d;
    in>>a>>n;
    euclid(a, n, d, x, y);
    if(x<0){
        while(x<0)
            x+=n;
    }
    out<<x;

    return 0;
}