#include <iostream>
using namespace std;
int main() {
int n,v[101],k=0,u,p,i;
cin>>n;
for(i=0;i<n;i++){
cin>>v[i];
u=v[i]%10;
v[i]=v[i]/10;
p=v[i]%10;
if(u==p){
k++;
}
}
cout<<k;
return 0;
}
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