#define _CRT_SECURE_NO_WARNINGS 1
#include <iostream>
using namespace std;
int main()
{
	char c;
	int n[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 },s=0;
	while ((c = getchar()) != '\n') {
		if (c == ' ')
			s++;
		else
			s += n[(c - 97)];
		
	}
	cout << s;

	
}