/// invers modular
/// inversul modular al lui a este a^(b - 2)%b unde n e prim
/// se foloseste la calculul combinarilor
#include <iostream>
#include <fstream>
#include <utility>
#include <algorithm>
#define m 1999999973
///#define f cin
///#define g cout
using namespace std;

ifstream f("inversmodular.in");
ofstream g("inversmodular.out");

long long a, b;

long long ridicareput(long long n, long long p, long long mod)
{
    long long ans = 1;
    while(p)
    {
        if(p % 2 == 0)  ans *= n % mod;
        p /= 2;
        n *= n % mod;
    }
    return ans - 1;
}

int main()
{
    f >> a >> b;
    g << ridicareput(a, b - 2, b) % b; /// il ridic pe a la b - 2 si fac asta mod b
    return 0;
}