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

using namespace std;

int main()
{
    long long int a=1; long long int b=1; string tempnumber; long long int number; int length=0; long long int temp; long long int k=0;
    cin >> tempnumber;

    length=tempnumber.length();
    number=strtoll(tempnumber.c_str(), NULL, 10);

    if(tempnumber=="0" || tempnumber=="1")
        {
        cout << tempnumber;
        return 0;
        }


    k=2;

    while(k<pow(10, 6))
        {
            temp=a;
            a=a+b;
            b=temp;
            k++;

            if(a>=pow(10, length))
                a=a-pow(10, length)+1;

            if(a==number)
                {
                    cout << k;
                    return 0;
                }
        }

    cout << "NIE";

    return 0;
}