#include<bits/stdc++.h>
using namespace std;
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};
int main()
{
	char b;
	long long s=0;
	while((b=getchar())!=EOF)
		if(b==' ')
		    s++;
		else
			s+=a[(int)(b-'a')];
	cout<<s;
	return 0;
}