#include <fstream>
using namespace std;

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

void euclid(int a, int b, long long &x, long long &y) {
    if (b == 0) {
        x = 1;
        y = 1;
    } else {
        long long x1, y1;
        euclid(b, a % b, x1, y1);
        x = y1;
        y = x1 - a / b * y1;
    }
}

long long invers_modular(int a, int n) {
    long long x, y;
    euclid(a, n, x, y);
    while (x < 0) {
        x += n;
    }
    return x;
}

int main() {
    int a, n;
    fin >> a >> n;

    long long inv_mod = invers_modular(a, n);

    fout << inv_mod;
    return 0;
}