Untitled

#include<iostream>  

using namespace std; 

int main(){ 
	long long int n, arr[100000];  
	long long int count = 0;
	cin >> n; 
	for(int i = 0; i < n; i++){ 
		cin >> arr[i];	 
	} 
	for(int i = 0; i < n; i++){ 
			if(arr[i] == arr[i+1]){ 
				count++;
	}
} 
	cout << count;
}