#include <bits/stdc++.h>
#define QED fin.close(); fout.close(); return 0;
using namespace std;
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
#define cin fin
#define cout fout

void EuclidExtins(int a, int b, int &d, int &x, int &y)
{
    if(b == 0)
    {
        x = 1, y = 0, d = a;
    }
    else
    {
        int x0, y0;
        EuclidExtins(b, a % b, d, x0, y0);
        x = y0;
        y = x0 - (a / b) * y0;
    }
}

int main()
{
    int a,n,d,x,y;
    cin>>a>>n;
    EuclidExtins(a,n,d,x,y);
    x%=n;
    cout<<x;
    QED
}