import re

def main():

    s = input()
    
    result = judge(s)

    print(result)

def judge(s):
    """
    >>> judge('mi--nminminminmi-------n')
    5
    """

    result = re.findall("mi-*n",s)
    return len(result)

if __name__=='__main__':
    import doctest
    doctest.testmod()
    main()