#include <iostream>
#include <fstream>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int A,N; long long x,y;
void euclid(int a, int b, long long &x,long long &y)
{
    if(!b)
    {
        x=1;
        y=0;
    }
    else
    {
        euclid(b,a%b,x,y);
        long long aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}
int main()
{
    f>>A>>N;
    euclid(A,N,x,y);
    while(x<=0) x=N+x%N;
    g<<x<<'\n';
    return 0;
}