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#include <cstdio>
#include <iostream>

using namespace std;

unsigned long long costam(unsigned long long N) {
  unsigned long long mod = 1;
  unsigned long long tmp = N;
  while (tmp) {
    mod *= 10ULL;
    tmp /= 10ULL;
  }
  unsigned long long fMinus2 = 0;
  unsigned long long fMinus1 = 1;
  unsigned long long fNow = 1;
  for (unsigned long long i = 2; i < 50000000ULL; ++i) {
    fNow = (fMinus2 + fMinus1)%mod;
    if (fNow == N) return i;
    fMinus2 = fMinus1;
    fMinus1 = fNow;
  }
  return 0;
}

int main() {
  std::ios::sync_with_stdio(false);
  unsigned long long n;
  cin >> n;
  if (n == 0ULL) {
    cout << 0 << endl;
    return 0;
  }
  if (n == 1) {
    cout << 1 << endl;
    return 0;
  }
  unsigned long long ret = costam(n);
  if (ret == 0)
    cout << "NIE" << endl;
  else
    cout << ret << endl;
}