#include <iostream>
using namespace std;
int main() {
int counter=0,n;
string a="",temp;
cin>>n;
if(n==1)
{
cout<<1;
return 0;
}
for(int i=0;i<n;i++){
temp=a;
cin>>a;
if(temp[1]==a[1])
continue;
else
counter++;
}
cout<<counter;
return 0;
}
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