#include <stdio.h>

int main(void)
{
	char ch;
	int n = 0;//n为出现的次数
	ch = getchar();
	while(ch != '#')
	{
		if (ch == 'e')
		{
			ch = getchar();
			if (ch == 'i')
			{
				n++;
			}	
		}
		else
			ch = getchar();
	}
	printf("ei出现的次数为%d\n", n);
}