#include <iostream>
#include<bits/stdc++.h>
using namespace std;
 
int main() {
	int n ; cin>>n;
	vector<int>arr(n);
	for(int i = 0 ; i<n;i++) cin>>arr[i];
	// your code goes here
	vector<int>pre(n);
	pre[0] = arr[0];
	for(int i = 1; i<n;i++){
		pre[i]=pre[i-1]+arr[i];
	}
	int count = 0 ; 
	for(int i = 0 ; i<n;i++){
		int sum = 0 ; 
		for(int j = i;j<n;j++){
			sum+=arr[j]; cout<<sum<<" ";
 
			int focus_sum = sum-(arr[i]+arr[j]);
			cout<<focus_sum<<endl;
			if(arr[i]==arr[j] && focus_sum==arr[i]){
				count++;
			}
		}
	}
	cout<<count;
 
	return 0;
}

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