s = input()

# count 'min after eliminating '-'
# s = s.replace('-', '')
# ans = s.count('min')

# regex
# import re
# ans = len(re.findall('mi-*n', s))

n = len(s)
ans = 0
i = 0
while 0 <= i < n:
    i = s.find('mi', i)
    if i != -1:
        i += 2
        while i < n and s[i] == '-':
            i+= 1
        if i < n and s[i] == 'n':
            ans += 1
            i += 1

print(ans)