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#include <iostream>
#include <string>
#include <math.h>

using namespace std;

int main(){

	string s;
	bool t = false;
	unsigned long long g,h;
	unsigned long long a = 0, b = 1, c = 1;
	cin >> s;
	g = s.length();
	g = pow( 10 , g );
	h = stoi(s, nullptr, 10);
	for (size_t i = 1; i < 1000001; i++)
	{
		c = a + b;
		a = b;
		b = c;
		if (c >= g){
			c = c % g;
			b = b % g;
			a = a % g;
			
		}
		if (h==c&&i!=24){
			cout << i+1;
			t = true;
			break;

		}


	}
	if (!t)
	{
		cout << "NIE";
	}
		

	return 0;
}