#include<bits/stdc++.h>
#include<atcoder/modint>
#define int long long
#define double long double
using namespace std;
const int inf=1e18;
using mint=atcoder::modint;
signed main(){
    string x;cin>>x;
    reverse(x.begin(),x.end());
    int id=0;
    while(id<x.size()&&x[id]!='.')id++;
    int ans=0;
    reverse(x.begin(),x.end());
    double u=stold(x);
    double d=1;
    if(id!=x.size()){
        for(int i=0;i<id;i++){
            u*=10;
            d*=10;
        }
    }
    int up=u;
    int down=d;
    int g=gcd(up,down);
    up/=g;
    down/=g;
    while(up!=0){
        swap(up,down);
        up%=down;
        ans++;
    }
    cout<<ans<<endl;
}