#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	vector<int>nums(n+5);
	for(int i=0;i<n;++i){
		cin>>nums[i];
	}
	int total_sum=0;
	for(int num:nums){
		total_sum+=num;
	}
	if(total_sum%3!=0){
		cout<<0<<endl;
		return 0;
	}
	int target=total_sum/3;
	int count=0;
	vector<int>prefix_sum(n+5,0);
	for(int i=1;i<=n;++i){
		prefix_sum[i]=prefix_sum[i-1]+nums[i-1];
	}
	for(int i=1;i<n;++i){
		if(prefix_sum[i]==target){
			for(int j=i+1;j<n;++j){
				if(prefix_sum[j]-prefix_sum[i]==target){
					count++;
				}
			}
		}
	}
	cout<<count;
	return 0;
}