#include <bits/stdc++.h>
using namespace std;
void euclid_extins(long long a, long long b, long long &x, long long &y, long long &d){
    if(b == 0){
        x = 1;
        y = 0;
        d = a;
        return ;
    }
    euclid_extins(b, a%b, x, y, d);
    long long newx = y;
    long long newy = x - y*(a/b) ;
    x = newx;
    y = newy;
}
ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");
int main()
{
    long long n, a, x, y, d;
    fin >> a >> n;
    euclid_extins(a, n, x, y, d);
    x %= n;
    if(x < 0) x += n;
    fout << x;
    return 0;
}