#include <iostream>
#include <bits/stdc++.h>
using namespace std;

#define il long long

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

il x,y,aux;

void euclid(il a,il b){
    if(b==0){
        x=1;
        y=0;
    }
    else{
        euclid(b,a%b);
        aux=x;
        x=y;
        y=aux-(a/b)*y;
    }


}





int main()
{
    il n,a,d;
    fin>>a>>n;
    euclid(n,a);
    while(y<0){y+=n;}
    fout<<y;

}