#include <bits/stdc++.h>
#define ll long long
#define all(a) (a).begin(), (a).end()
//#pragma GCC optimize("O3")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define sz() size()
#define fr first
#define sc second
#define pb push_back
#define er erase
#define in insert
#define pi pair<int,int>
#define pii pair<pair<int,int>,int>
#define mp make_pair
#define int long long
#define rc(s) return cout<<s,0
#define rcc(s) cout<<s,exit(0)
///#define cin fin
///#define cout fout
using namespace std;

const int mod=1e9+7;

int a,n;

void invers(int a,int b,int &X,int &Y){
    if(b==0){  X=1;Y=0;}
    else{
        invers(b,a%b,X,Y);
        int tz=X;
        X=Y;
        Y=tz-(a/b)*Y;
    }
}

int32_t main(){
	//ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
    srand(chrono::steady_clock::now().time_since_epoch().count());
    ifstream fin("inversmodular.in");
    ofstream fout("inversmodular.out");
    fin >> a >> n;
    int X0=0,Y0=0;
    invers(a,n,X0,Y0);
    X0=X0%n;
    if(X0<0) X0+=n;
    fout << X0 << '\n';
}