#include <stdio.h>
#include <string.h>

int main(void) {
	int i,l,p=0,r = 0;
	char s[128],t[4]="min";
	scanf("%s",s);
	l = strlen(s);
	for(i = 0;i < l;i++){
		if(s[i] == t[p]){p++;}
		if(p == 3){r++;p = 0;}
	}
	printf("%d\n",r);
	return 0;
}