#include <iostream> using namespace std; int main() { int x; cin >> x; int prev = 0; int aux = 0; int fibonacciValue = 1; int currentFibonacciNumber = 1; while (fibonacciValue < x) { aux = fibonacciValue; fibonacciValue += prev; prev = aux; currentFibonacciNumber++; } cout << currentFibonacciNumber-1; return 0; }