#include<iostream>
#include<cstring>
using namespace std;
int main(){
    int ans = 0;
    int a[26] = {1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,1,2,3,4,1,2,3,1,2,3,4};
    string s;
    getline(cin, s);
    for (int i = 0; i < s.length(); i++)
        if (s[i] == ' ') ans += 1;
        else ans += a[s[i]-'a'];
    cout << ans << endl;
    return 0;
}