#include <bits/stdc++.h>

using namespace std;

#define ULL unsigned long long
#define FOR(i, m, n) for(int i = m; i < n; i++)

int main() {
    ULL n, m;
    cin >> n >> m;
    ULL a = 0, b = 1, c;
    FOR(i, 2, n) {
        c = (a + b) % m;
        a = b;
        b = c;
    }
    cout << b << endl;
    return 0;
}