from sys import stdin
tokens = stdin.read().split()
n = int(tokens[0])
islands = 0
old_type = ""
for island in tokens[1:n + 1]:
if island != old_type:
islands += 1
old_type = island
print islands
ZnJvbSBzeXMgaW1wb3J0IHN0ZGluCgp0b2tlbnMgPSBzdGRpbi5yZWFkKCkuc3BsaXQoKQpuID0gaW50KHRva2Vuc1swXSkKaXNsYW5kcyA9IDAKb2xkX3R5cGUgPSAiIgpmb3IgaXNsYW5kIGluIHRva2Vuc1sxOm4gKyAxXToKCWlmIGlzbGFuZCAhPSBvbGRfdHlwZToKCQlpc2xhbmRzICs9IDEKCQlvbGRfdHlwZSA9IGlzbGFuZAoKcHJpbnQgaXNsYW5kcw==