#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int n;
    cin >> n;
    int m;
    cin >> m;
    mint::set_mod(m);
    vector<mint> dp(n);
    dp[0] = 0;
    dp[1] = 1;
    for(int i=2;i<n;i++){
        dp[i] = dp[i-1] + dp[i-2];
    }
    cout << dp[n-1].val() << endl;
    return 0;
}