#include <stdio.h>

int main()
{
	char S[101];
	int len, b = 0, count = 0;

	scanf("%s%n", &S, &len);

	for (int i = 0; i < len - 3; i++)
	{
		if (S[i] == 'm')
		{
			count++;
		}
	}

	printf("%d", count);

	return 0;
}