#include <bits/stdc++.h>
inline void euclid(int a, int b, int &x, int &y) {
    if (b == 0)
        x = y = 1;
    else {
        int x1, y1;
        euclid(b, a % b, x1, y1);
        x = y1;
        y = x1 - a / b * y1;
    }
}
int a, MOD, x, y;
int main() {
	std :: ifstream fin("inversmodular.in");
    fin >> a >> MOD;
    fin.close();
    euclid(a, MOD, x, y);
    while (x < 0)
        x += MOD;
	std :: ofstream fout("inversmodular.out");
    fout << x;
    fout.close();
    return 0;
}