s = input()
i = 0
count = 0
mi = False

while i < len(s) - 1:

    if mi:
        if s[i] == 'n' and not s[i + 1] == 'n':
            count += 1
            mi = False
        elif s[i] == '-':
            pass
        else:
            mi = False
        i += 1
    else:
        if s[i] == 'm' and s[i + 1] == 'i':
            mi = True
            i += 2
        else:
            i += 1

print(count)