def main():
    S = input()
    ctr = 0
    current_idx = 0
    while current_idx < len(S):
        current_idx = S.find("mi", current_idx)
        if current_idx == -1:
            break
        current_idx = S.find("n", current_idx+2)
        if current_idx == -1:
            break

        ctr += 1
        current_idx += 1
    print(ctr)


if __name__ == "__main__":
    main()