#include <bits/stdc++.h>
using namespace std;
ifstream f("inversmodular.in");
ofstream g("inversmodular.out");
int n,a,v1,v2;
void euclid(int a, int b, int &x, int &y)
{
    if(b==0)
    {
        x=1;y=0;
    }
    else
    {
        euclid(b,a%b,x,y);
        int aux=x;x=y;y=aux-y*(a/b);
    }
}
int main()
{
    f>>a>>n;
    euclid(a,n,v1,v2);
    while(v1<=0)v1+=n;
    g<<v1;
    return 0;
}