#include <bits/stdc++.h>
using namespace std;
// type
typedef long long ll;
typedef long double ld;
// loop
//#define For(i, l, r, x) for (int i = l; i < r; i+=x)
//#define ForE(i, l, r, x) for (int i = l; i <= r; i+=x)
//#define Ford(i, r, l) for (int i = r; i > l; i--)
//#define FordE(i, r, l) for (int i = r; i >= l; i--)
//#define Fora(i, a) for (auto i : a)
// I/O
#define FAST_IO std::ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
//#define PrintV(a) Fora(ii, a) cout << ii << ' '; cout << rl;
//#define PrintVl(a) Fora(ii, a) cout << ii << rl;
//#define PrintA(a, l, r) for (int ii = l; ii <= r; ii++) cout << a[ii] << ' '; cout << rl;
//#define PrintAl(a, l, r) for (int ii = l; ii <= r; ii++) cout << a[ii] << rl;
//#define Ptest(x) return cout << x, 0;
#define setpre(n) fixed << setprecision(n)
// pair
#define F first
#define S second
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pdd pair<ld, ld>
// vector & !!?(string)
#define eb emplace_back
#define pb push_back
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define sz(a) a.size()
#define len(a) a.length()
// geometry calc
#define pi acos(-1.0)
#define g_sin(a) sin(a*pi/180)
#define g_cos(a) cos(a*pi/180)
#define g_tan(a) tan(a*pi/180)
// set val
#define ms0(a) memset(a, 0, sizeof(a));
#define ms1(a) memset(a, 1, sizeof(a));
#define msn1(a) memset(a, -1, sizeof(a));
#define msinf(a) memset(a, 0x3f3f3f, sizeof(a));
// constant
const int mod1 = 998244353, mod = 1e9+7;
const int MAXN = 1000005, MAXM = 200010;
// code
//#define int long long
vector<int> add(vector<int> a){
for (int i = a.size() - 1; i >= 0; i--){
if (a[i] == 9){
a[i] = 0;
if (i == 0){
vector<int> ans(a.size() + 1, 0);
ans[0] = 1;
return ans;
}
}else{
a[i] ++;
return a;
}
}
}
vector<int> mul(vector<int> a){
vector<int> ans;
if (a[0] >= 5){
ans.resize(a.size()+1);
for (int i = ans.size()-1; i >= 1; i--){
ans[i] = a[i-1];
}
ans[0] = 0;
}else{
ans = a;
}
for (int i = 0; i < ans.size(); i++){
ans[i] *= 2;
if (i > 0) ans[i-1] += ans[i] / 10;
ans[i] %= 10;
//cout << ans[i];
}
//cout << endl;
//for (auto v:ans) cout << v;
return ans;
}
void Solve(){
string s; cin >> s;
vector<int> ans(1, 0);
//ans = mul(ans);
//for (auto v:ans) cout << v; cout << endl;
for (char c:s){
int k = c-'0';
ans = mul(ans);
if (k) ans = add(ans);
//cout << ans << endl;
}
for (auto v:ans) cout << v;
}
signed main(){
//freopen(".inp", "r", stdin);
//freopen(".out", "w", stdout);
FAST_IO;
int TC = 1;
//cin >> TC;
while(TC--) Solve();
//cerr << "Time elapsed : " << 1.0 * clock() / CLOCKS_PER_SEC << " sec \n";
return 0;
}
