import os
import sys

LETTERS = {}
for idx,letter in enumerate("ABCDEFGHIJKLMNOPQRSTUVWXYZ"):
    LETTERS[letter] = idx+1

def get_word_value(word):
    total_value = 0
    for letter in word:
        val = LETTERS[letter]
        total_value += val
    return total_value

all_triangle_numbers = []
def update_triangles(val):
    top_idx = len(all_triangle_numbers)

    if top_idx == 0:
        top_idx = 1
        all_triangle_numbers.append(1.0)

    while all_triangle_numbers[-1] < val:
        all_triangle_numbers.append(0.5*top_idx*float(top_idx+1))
        top_idx += 1

def is_triangle(val):
    if val > len(all_triangle_numbers):
        update_triangles(val)

    if val in all_triangle_numbers:
        return True
    else:
        return False

def main():
    w_file = open("p42_words.txt", "r")
    words = w_file.read().split(",")

    num_triangles = 0
    for word in [ x[1:-1].upper() for x in words ]:
        w_value = get_word_value(word)
        if is_triangle(w_value):
            num_triangles += 1

    print num_triangles

if __name__ == "__main__":
    sys.exit(main())