// yukicoder: No.418 ミンミンゼミ
// 2019.4.15 bal4u

#include <stdio.h>
char S[105];

int main()
{
	int ans;
	char *p;
	scanf("%s", S);
	ans = 0, p = S;
	while (*p) {
		if (*p == 'm' && *(p + 1) == 'i') {
			p += 2;
			while (*p == '-') p++;
			if (*p == 'n' && (
				*(p+1) == 0 || *(p + 1) == 'm' && *(p + 2) == 'i')) {
				ans++, p++;
			}
		} else p++;
	}
	printf("%d\n", ans);
	return 0;
}