#include <stdio.h>

int priceinner(char* remain, int price) {
	if(remain[0] == 0) {
		return price;
	} else {
		return priceinner(remain+1, price + remain[0] - 'a');
	}
}


int pricestr(char* str) {
	return priceinner(str, 0);
}

int main(void) {
	char* str = "aaa";
	printf("%d", pricestr(str));
}