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#include <iostream>
#include <cstdio>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <vector>
#include <utility>
#include <string>
#include <math.h>

using namespace std;

int main(){
	char string[20];
	scanf("%s", string);

	char* str = string;


	unsigned long long number = atol(str);
	int length = strlen(string);

	unsigned long long numbers = (unsigned long long)(pow( 10, length ));
	unsigned long long a = 0;
	unsigned long long b = 1;
	unsigned long long c = 0;

	for(unsigned long long k = 2 ; k < 15000000; ++k){
		c = a + b;
		a = b;
		b = c;
		if(c > 1000000000000000000){
			c = c % 1000000000000000000;
			b = b % 1000000000000000000;
			a = a % 1000000000000000000;
		}

		if((c % numbers) - number == 0){

			printf("%llu ", k);
			return 0;
		}
	}
	printf("%s", "NIE");
	return 0;

}