#include <iostream> #include <vector> using namespace std; int count_sequences(int n) { vector<int> dp(n + 1, 0); dp[0] = 1; for (int i = 1; i <= n; ++i) { for (int j = 1; j <= i / 2; ++j) { dp[i] += dp[i - j]; } } return dp[n]; } int main() { int n; cin >> n; cout << count_sequences(n) << endl; return 0; }