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//Tadrion
#include <cstdio>
#include <vector>
#include <iostream>
#include <deque>
#include <map>
#include <set>
#include <string>
#include <cstring>
#include <cstdlib>
#include <cstdint>
#include <cmath>
#include <queue>
#include <stack>
#include <algorithm>
#include <utility>
using namespace std;
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define CLEAR(x) (memset(x,0,sizeof(x)))
#define SZ(x) ((int)(x).size())
#define ALL(x) (x).begin(),(x).end()
#define VAR(v, n) __typeof(n) v = (n)
#define FOR(x, b, e) for(int x = b; x <= (e); ++x)
#define FORD(x, b, e) for(int x = b; x >= (e); --x)
#define REP(x, n) for(int x = 0; x < (n); ++x)
#define FOREACH(i, c) for(VAR(i,(c).begin()); i != (c).end(); ++i)
#define DBG(v) cout<<#v<<" = "<<v<<endl;
#define IN(x,y) ((y).find(x)!=(y).end())
#define ST first
#define ND second
#define PB push_back
#define PF push_front
#define MP make_pair
typedef long long int LL;
typedef pair<int,int> PII;
typedef vector<int> VI;


const long long RRR = 1000000000000000000LL;

struct Matrix {
     long long a[2][2];
public:
    Matrix() {}
    Matrix(LL b) {
        if(b==1) {
            a[0][0] = 1; a[0][1]=1; a[1][0]=1; a[1][1]=0;
        }
        else if(b==0) {
            a[0][0] = 1; a[1][1]=1;
            a[0][1] = 0; a[1][0]=0;
        }
    }
    Matrix multMod(Matrix,  long long);
};



unsigned long long multLongMod(unsigned long long a, unsigned long long b, long long M) {
    int cur = 0;
    long long res = 0;
    while(b > 0) {
        LL c = b%10;
        //assert(b>0);
        b/=10;

       unsigned long long cc = c*a;
        FOR(i,1,cur) {
            cc *= 10;
            cc %= RRR;
        }
        res = (res + cc)%RRR;
        cur++;
    }
    return res%M;
}

Matrix Matrix::multMod(Matrix b,  long long M) {
    Matrix temp(0);
    //FOR(i,0,1) FOR(j,0,1) temp.a[i][j] = ((a[i][0]*b.a[0][j])%M + (a[i][1]*b.a[1][j])%M)%M;
    FOR(i,0,1) FOR(j,0,1) temp.a[i][j] = (multLongMod(a[i][0],b.a[0][j],M) + multLongMod(a[i][1],b.a[1][j],M))%M;
    return temp;
}

Matrix powMod(LL n, LL M) {
    Matrix temp(0);
    if(n==0) return temp;
    temp = powMod(n/2,M);
    temp = temp.multMod(temp,M);
    if(n%2 == 0) return temp;
    else {
        Matrix temp2(1);
        temp = temp.multMod(temp2,M);
        return temp;
    }
}

 unsigned long long fibMod(LL k, LL M) {
        Matrix temp(0);
        temp = powMod(k+1,M);
        return temp.a[1][1];
}

 unsigned long long a[50];

 unsigned long long poww10(LL k) {
    long long r = 1;
    FOR(i,1,k) r*=10;
    return r;
}

string s;

int main() {
  //FOR(i,1,1000) {
  //  cout << fibMod(i,100) << "\n";
  //}

  a[0]=1;
  a[1]=60;
  /*for(LL r=2; r <= 18; r++) {
    for(LL k=1; k<=100; k++) {
        if(fibMod(a[r-1]*k,poww10(r)) == 0 &&
           fibMod(a[r-1]*k+1,poww10(r)) == 1) {
            a[r] = a[r-1]*k;
            cout << r << " " << a[r] << "\n";
            fflush(stdout);
            break;
           }
    }
  }
  */

  a[2]=300;
  a[3]=1500;

  unsigned long long cur = 0;
  FOR(i,4,18) a[i]=10LL*a[i-1];
  cin >> s;
  //cout << SZ(s) << "\n";
    FOR(j,0,SZ(s)-1) {
        cur = 10*cur + (s[j]-'0');
    }
  //cout << cur << "\n";
  if(cur < 10000) {
    int ok = 0;
    FOR(i,60,15061) {
        if(fibMod(i,poww10(SZ(s))) == cur)
            {
                cout << i << "\n";
                ok=1;
                break;
            }
    }
    if(ok==0) cout << "NIE\n" << "\n";
  }
  else {
    //printf("tu");
    //cout << cur << "\n";

    set<unsigned long long> kand;
    FOR(i,60,30061) {
        if(fibMod(i,poww10(4LL)) == cur%10000)
            {
                kand.insert(i);
                //cout << i << "\n";
            }
    }
    int ind = 5;
    while(!kand.empty()) {
        if(poww10(ind) > cur) break;
        set< unsigned long long> newkand;
        FOREACH(it,kand) {
            for(unsigned long long i=0; i <= 10; i++)
                if(fibMod((*it) + (i*a[ind-1]),poww10(ind)) == (cur%poww10(ind))) {
                    newkand.insert(((*it) + i*a[ind-1])%poww10(ind));
                        //cout << ind << " " <<((*it) + i*a[ind-1])%poww10(ind) << "\n";
                }
        }
        ind++;
        kand = newkand;
    }
    if(kand.empty()) cout << "NIE\n";
    else cout << *(kand.begin()) << "\n";
  }

/*
  unsigned long long kk = 0;
  FORD(i,SZ(s)-1,0) {
    unsigned long long cur = 0;
    FOR(j,i,SZ(s)-1) {
        cur = 10*cur + (s[j]-'0');
    }
    int lenn = SZ(s)-i;
    while(fibMod(kk,poww10(lenn))!=cur) {
        kk += a[lenn-1];
    }
    cout << cur << " " << kk << "\n";
    fflush(stdout);
  }
  cout << kk << "\n";
*/
  //cout << fibMod(60,100) << "\n";
  //cout << fibMod(61,100) << "\n";
  return 0;
}