import sys
readline=sys.stdin.readline

lst=[]
ans=0
for s in readline().rstrip():
    if len(lst)==0 and s=="m":
        lst.append(s)
    elif len(lst)==1 and s=="i":
        lst.append(s)
    elif len(lst)==2 and s=="n":
        lst.append(s)
    if len(lst)==3:
        ans+=1
        lst=[]
print(ans)