#include<cstdio>
using namespace std;
int a[21],sum,i,j,ans,n,x;
int main()
{
scanf("%d",&n);
for (i=1;i<=n;i++)
{
scanf("%d",&x);
a[i]=a[i-1]+x;
}
sum=a[n]/2;
for (i=1;i<=n;i++)
{
if (a[i-1]>=sum) break;
for (j=i+1;j<=n;j++)
if (a[j-1]-a[i-1]==sum) break;
if (a[j-1]-a[i-1]==sum) ans++;
}
printf("%d",ans*(ans-1)/2);
return 0;
}