#include <bits/stdc++.h>

[[nodiscard]] static inline constexpr uint_fast32_t solve(const std::string& S) noexcept
{
	[[assume(S[0] == 'm')]];
	uint_fast32_t ans = 0;
	for (const auto& s : S)
		if (s == 'm') ++ans;

	return ans;
}

int main()
{
	std::cin.tie(nullptr);
	std::ios::sync_with_stdio(false);

	std::string S;
	S.reserve(100), std::cin >> S;

	std::cout << solve(S) << '\n';
	return 0;
}