#include <iostream> using namespace std; int main() { int k; cin >> k; int a = 1, b = 1, c = 0; // Initialize c properly if (k == 1 || k == 2) { cout << 1; } else { for (int i = 3; i <= k; i++) { c = a + b; a = b; b = c; } cout << c; } return 0; }