#include<cstdio>
#include<string>
#include<iostream> 
using namespace std;
int num[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};


int main()
{
    int cnt=0;
    string s;
    getline (cin, s);
    for(int i = 0; i < s.size(); i++)
    {
        if(s[i]!=' ')
		cnt+=num[s[i]-'a'];
        else cnt++;
    }
    cout<<cnt;
    
    return 0;
}