#include <bits/stdc++.h>
using namespace std;
typedef long long i64;

pair<int, int> extended_gcd(int a, int b) {
    if (b == 0) {
        return {1, 0};
    }

    pair<int, int> r = extended_gcd(b, a % b);
    return {r.second, (r.first - a / b * r.second)};
}

int inv(int x, int MOD) {
    int ans = extended_gcd(x, MOD).first;
    if (ans < 0)
        ans += MOD;
    return ans;
}


int main() {
    freopen("inversmodular.in",  "r", stdin);
    freopen("inversmodular.out", "w", stdout);
    int N, M;
    cin >> N >> M;
    cout << inv(N, M);
}