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#include<cstdio>
#include<cstring>
#define llu unsigned long long

struct mac
{
	llu pg,pd,lg,ld;
};

llu mnoz(llu a1,llu a2)
{
	llu o=0;
	for(int i=0;i<64;i++)
	{
		if(a2&(1llu<<i))o=(o+a1)%1000000000000000000ll;
		a1=(2*a1)%1000000000000000000ll;
	}
	return o;
}

mac operator*(mac a1,mac a2)
{
	mac o;
	o.pg=(mnoz(a1.lg,a2.pg)+mnoz(a1.pg,a2.pd))%1000000000000000000ll;
	o.lg=(mnoz(a1.lg,a2.lg)+mnoz(a1.pg,a2.ld))%1000000000000000000ll;
	o.pd=(mnoz(a1.pd,a2.pd)+mnoz(a1.ld,a2.pg))%1000000000000000000ll;
	o.ld=o.pg;
	return o;
}

llu sk1[21],il[21],spr,suf,wyn;
int l;
char d[100];
mac nullmac,mt,prim,mpt[100];

mac pot(mac m1,llu pt)
{
	mac o=m1;
	pt--;
	for(int i=0;i<64;i++)if(pt&(1llu<<i))o=o*mpt[i];
	return o;
}


int main()
{
	prim.lg=1;prim.pg=1;prim.ld=1;
	scanf("%s",d);
	l=strlen(d);
	spr=1;
	for(int i=0;i<l;i++)spr*=10;
	mpt[0]=prim;
	for(int i=1;i<64;i++)mpt[i]=mpt[i-1]*mpt[i-1];
	for(int i=0;i<l;i++)suf=suf*10+d[i]-48;
	sk1[0]=1;sk1[1]=15;sk1[2]=150;sk1[3]=1500;
	for(int i=4;i<=18;i++)sk1[i]=sk1[i-1]*10;
	mt=prim;
	llu p1=1;
	llu p2=1;
	wyn=1;
	while(p1!=suf)
	{
		llu p3=(p1+p2)%spr;
		p1=p2;
		p2=p3;
		wyn++;
		if(wyn==10000000){printf("NIE");return 0;}
	}
	for(int i=0;i<=20;i++)wyn+=sk1[i]*il[i];
	printf("%lld\n",wyn);
}