n=int(input())
js=0
for i in range(1,n+1):
    sr=input()
    if (sr[0]>="A" and sr[0]<="G") or (sr[0]>="R" and sr[0]<="T"):
        js=js+1
print(n-js)
/**************************************************************
	Problem: 1181
	User: admin
	Language: Python
	Result: Accepted
	Time:98 ms
	Memory:34480 kb
****************************************************************/