S = input()

flg_m = 1
flg_i = 0
flg_n = 0

ans = 0

for s in S :
    if s == "m" and flg_m :
        flg_m = 0
        flg_i = 1
    elif s == "i" and flg_i :
        flg_i = 0
        flg_n = 1
    elif s == "n" and flg_n :
        flg_n = 0
        flg_m = 1
        ans += 1
print(ans)