#include <iostream>
using namespace std;

int main()
{
	char c;
	int n=0;
	int cnt = 0;
	while (cin>>c) {
		if (c == 'm'&&n == 0) n = 1;
		else if (c == 'i'&&n == 1) n = 2;
		else if (c == '-'&&n == 2) continue;
		else if (c == 'n'&&n == 2) {
			cnt++;
			n = 0;
		}
		else n = 0;
	}

	cout << cnt << endl;

    return 0;
}