#include <iostream> using namespace std; int countWaysToEatChocolates(int N) { int dp[20] = {0}; dp[0] = 1; dp[1] = 1; for (int i = 2; i <= N; ++i) { dp[i] = dp[i - 1] + dp[i - 2]; } return dp[N]; } int main() { int N; cin >> N; if (N >= 0 && N <= 20) { int ways = countWaysToEatChocolates(N); cout << ways << endl; } else { cout << "输入的N不符合要求，请重新输入。" << endl; } return 0; }