#include <bits/stdc++.h>
#define rep(i, a, n) for(int i = a; i < n; i++)
#define repb(i, a, b) for(int i = a; i >= b; i--)
#define all(a) a.begin(), a.end()
#define o(a) cout << a << endl
#define int long long
#define fi first
#define se second
using namespace std;
typedef pair<int, int> P;

int dp[5000010];

signed main(){
    int n, m;
    cin >> n >> m;
    dp[1] = 0;
    dp[2] = 1;
    rep(i, 3, n + 1){
        dp[i] = (dp[i - 1] + dp[i - 2]) % m;
    }
    cout << dp[n] << endl;
}