#include <fstream>

using namespace std;

ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

int a, x, m, y;

void euclid(int a, int b, int &x, int &y){
    if(b == 0){
        x = 1;
        y = 0;
        return;
    }
    int x0, y0;
    euclid(b, a%b, x0, y0);
    x = y0;
    y = x0 - y0*(a/b);
}

int main(){
    fin>>a>>m;
    euclid(a, m, x, y);
    if(x < 0)
        x += m;
    fout<<x;
    return 0;
}