#include<bits/stdc++.h>
using namespace std;

char c[1010][1010];
int main(){
	int n, m;
	cin >> n >> m;
	for (int i = 0; i < n; i++){
		for (int j = 0; j < m; j++){
			cin >> c[i][j];
		}
	}
	int ans = 0;
	for (int i = 0; i < n; i++){
		for (int j = 0; j < m; j++){
			if (j != m-1){
				if (c[i][j] == 'h' && c[i][j+1] == 'e') ans++;
			}
		}
	}
	cout << ans;
}