#include <bits/stdc++.h>
//freopen("transmitters.in","r",stdin);
//cout<<fixed<<setprecision(6)<<n<<endl;
// transform(s.begin(), s.end(), s.begin(), ::tolower);
//double PI=3.14159265359,c=0;
#define ll long long
//#define all(v) v.begin(),v.end()
using namespace std;
void fast()
{
    std::ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}
//long long arr[10];
int main ()
{
    fast();
    long long n=0,t,m=0,l,x=0,c=0;
     string s;
     cin>>s;
     for(int i=0;i<s.size();i++)
     c+=((s[i]-'a')+1);
     cout<<c<<endl;
        //system("pause");
    return 0;
}
 

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