#include <iostream>

int main()
{
    unsigned long long n, m;
    std::cin >> n >> m;
    
    unsigned long long f_2 = 0, f_1 = 0;
    unsigned long long f = 1;
    
    for(unsigned long long i = 2; i < n; i++)
    {
        f_2 = f_1;
        f_1 = f;
        
        f = f_2 + f_1;
        f %= m;
    }
    
    std::cout << f << std::endl;
    
    return 0;
}