#include <stdio.h>

int main(void) {
	char s[101];
	int i;
	int cnt = 0;
	scanf("%s", s);
	i = 0;
	while(s[i] != '\0'){
		if(s[i] == 'm' && s[i + 1] == 'i'){
			i += 2;
			while(s[i] != '\0'){
				if(s[i] == 'n'){
					cnt++;
					break;
				}
				i++;
			}
			
		}
		i++;
	}
	printf("%d\n", cnt);

	return 0;
}