#!/usr/bin/env python
# 2021 - Advent Of Code - 8

def parse_file(file):
    outs = []
    with open(file) as f:
        for line in f.readlines():
            _, out = line.strip().split('| ')
            outs.append(out)

    return outs


# outputs = parse_file('input_example.txt')
outputs = parse_file('input.txt')

count = 0
for o in outputs:
    words = o.split(' ')
    for w in words:
        length = len(w)
        if length in (2, 3, 4, 7):
            count += 1

print(f'{count}')