#include <bits/stdc++.h>
using namespace std;
using ll = long long;

long long intpow(long long a, long long b){ 
    long long ans = 1; 
    while(b){ 
        if(b & 1) ans *= a; 
        a *= a; 
        b >>= 1; 
    } 
    return ans;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll a = 0, b = 1;
    string s;
    cin >> s;
    for(int i = 0; i < s.size(); i++){
        if(s[i] == '.'){
            b = intpow(10, s.size() - (i + 1));
            break;
        }
    }
    for(int i = 0; i < s.size(); i++){
        if(s[i] == '.') continue;
        a *= 10;
        a += s[i] - '0';
    }
    ll g = gcd(a, b), ans = 0;
    a /= g, b /= g;
    while(a != 0){
        swap(a, b);
        a %= b;
        ans++;
    }
    cout << ans << '\n';
}