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