#include <iostream>
#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");

void EuclidExtins(int a, int b, int &d, int &x, int &y) { ///Varianta recursiva
    if(b==0) {
        x=1;
        y=0;
        d=a;
    } else {
        int x0,y0;
        EuclidExtins(b,a%b,d,x0,y0);
        x=y0;
        y=x0-(a/b)*y0;
    }
}

int inversMod(int A, int N) {
    int d, x, y;
    EuclidExtins(A, N, d, x, y);
    while(x<0) {
        x += N;
    }
    return x;
}

int main() {
    int A, N;
    f>>A>>N;
    g<<inversMod(A, N);
    f.close();
    g.close();
    return 0;
}