113?

xosqedem yox xosdeqem hidet qizi

include <bits/stdc++.h>

define ll long long

define ld long double

using namespace std; int main(){

ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
string n, x;
ll k, m, ans = 0;
cin>>n;
k = n.size()-1;
for(int i = 0; i<n.size(); i++){
    x = n[i];
    m = stoi(x);
    if(m == 1){
        ans+=(pow(2, k));
    }
    k--;
}
cout<<ans;

} //TECHNOBLADE NEVER DIE

include<bits/stdc++.h>

define ll long long

using namespace std; int main() { string s; cin>>s; ll a=0,p=1,n=s.length(); for(ll i=n-1;i>=0;i--){ if(s[i]=='1') { a+=p; } p*=2; } cout<<a; } //bele yazin