- count = 0 
- n = int(input()) 
- l = list() 
- for i in range (n): 
-    l.append(input()) 
- for j in range (len(l)): 
-    if type(l[j]) == list: 
-       if l[j](0) == '(' and l[j](-1) == ')': 
-          break 
-       else: 
-          count += 1 
-    else: 
-       count += 1 
-   
- print (count) 
-   
				Y291bnQgPSAwCm4gPSBpbnQoaW5wdXQoKSkKbCA9IGxpc3QoKQpmb3IgaSBpbiByYW5nZSAobik6CiAgIGwuYXBwZW5kKGlucHV0KCkpCmZvciBqIGluIHJhbmdlIChsZW4obCkpOgogICBpZiB0eXBlKGxbal0pID09IGxpc3Q6CiAgICAgIGlmIGxbal0oMCkgPT0gJygnIGFuZCBsW2pdKC0xKSA9PSAnKSc6CiAgICAgICAgIGJyZWFrCiAgICAgIGVsc2U6CiAgICAgICAgIGNvdW50ICs9IDEKICAgZWxzZToKICAgICAgY291bnQgKz0gMQogICAgICAKcHJpbnQgKGNvdW50KQo=