#include <stdio.h>

int main()
{
	char line[30];
	int n;
	scanf("%d", &n);
	getchar();
	int ans=0;
	while(n--)
	{
		scanf("%s", line);
		if(line[0]=='T')
			ans+=4;
		else if(line[0]=='C')
			ans+=6;
		else if(line[0]=='O')
			ans+=8;
		else if(line[0]=='D')
			ans+=12;
		else if(line[0]=='I')
			ans+=20;
	}
	printf("%d\n", ans);
	return 0;
}