#include<bits/stdc++.h>  
using namespace std;
int n,m,ans;
char a[1005][1005];
int main(){
    cin>>n>>m;   
    for(int i=1;i<=n;i++) for(int j=1;j<=m;j++) cin>>a[i][j];
    for(int i=1;i<=n;i++){
    	for(int j=1;j<=m;j++){
    		if(a[i][j]=='h'){
    			if(a[i][j+1]=='e'&&a[i][j+2]=='h'&&a[i][j+3]=='e')ans++;
    			if(a[i][j-1]=='e'&&a[i][j-2]=='h'&&a[i][j-3]=='e')ans++;
    			if(a[i+1][j]=='e'&&a[i+2][j]=='h'&&a[i+3][j]=='e')ans++;
    			if(a[i-1][j]=='e'&&a[i-2][j]=='h'&&a[i-3][j]=='e')ans++;
			}
		}
	}
	cout<<ans;
    return 0;   
}