#include <iostream>
#include <vector>

std::vector<long long> matvecmul(std::vector<std::vector<long long>> M1, std::vector<long long> v1, long long M)
{
    long long i, k;
    std::vector<long long> res(M1.size());

    for (i = 0; i < M1.size(); i++) {
        for (k = 0; k < M1[0].size(); k++) {
            res[i] += M1[i][k] * v1[k] % M;
            res[i] %= M;
        }
    }

    return res;
}

std::vector<std::vector<long long>> matmul(std::vector<std::vector<long long>> M1, std::vector<std::vector<long long>> M2, long long M)
{
    long long i, j, k;
    std::vector<std::vector<long long>> res(M1.size(), std::vector<long long>(M2[0].size()));

    for (i = 0; i < M1.size(); i++) {
        for (j = 0; j < M2[0].size(); j++) {
            for (k = 0; k < M1[0].size(); k++) {
                res[i][j] += (M1[i][k] % M) * (M2[k][j] % M) % M;
                res[i][j] %= M;
            }
        }
    }

    return res;
}

std::vector<std::vector<long long>> matpow(std::vector<std::vector<long long>> M, long long N, long long mod)
{
    long long i, j;
    std::vector<std::vector<long long>> res(M.size(), std::vector<long long>(M.size()));
    for (i = 0; i < res.size(); i++) {
        res[i][i] = 1;
    }

    while (N > 0) {
        if (N & 1) {
            res = matmul(M, res, mod);
        }
        M = matmul(M, M, mod);
        N >>= 1;
    }

    return res;
}

int main()
{
    long long N, M;
    std::vector<std::vector<long long>> F = {{1, 1}, {1, 0}};
    std::vector<long long> v = {1, 0};
    std::cin >> N >> M;

    std::cout << matvecmul(matpow(F, N - 2, M), v, M)[0] << std::endl;

    return 0;
}