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#include<stdio.h>
#include<stdlib.h>
#include<string>
#include<stdint.h>
#include<string.h>

#ifndef DEBUG
#define NDEBUG
#endif // DEBUG
#include<assert.h>

#ifdef DEBUG
#define log(format, ...)     printf(format "\n", __VA_ARGS__)
#else
#define log(...)
#endif

using namespace std;

int check(const char *val) {
    uint64_t fiba=0;
    uint64_t fibb=1;
    int valLen=strlen(val);
    char buf[24];

    bool passed=false;

    uint64_t mod=1ULL;
    uint64_t c=0;
    for(int i=0;i<valLen;++i) {
        mod*=10ULL;
        c=c*10+(val[i]-'0');
    }
    uint64_t min=mod/10;
    //printf("Val=%s, C=%llu, min=%llu, Mod=%llu\n",val, c,min,mod);

    int limit=1100000*(valLen<<2);
    for(int i=2;i<limit;++i) {
        uint64_t fibc=(fiba+fibb);
        if(passed || fibc>=min) {
            fibc%=mod;
            if(fibc==c) return i;
            passed=true;
        }
   		fiba=fibb;
		fibb=fibc;
    }
    return -1;
}

int main(int argc, char** argv) {
    char in[20];

    scanf("%s",in);

    int res=check(in);
    if(res==-1) printf("NIE\n");
    else printf("%d\n",res);

    return 0;
}