S = input()
l = list(S)
mi_ck = 0
count = 0

for i in range(len(l)):
    if l[i] == "m" and l[i + 1] =="i":
        mi_ck = 1
    if l[i] == "n" and mi_ck == 1:
        mi_ck = 0
        count += 1

print (count)