#include<iostream>
using namespace std;
int main()
{
	int n,i,x,s,k=0;
	cout<<"n="; cin>>n;
	for(i=1;i<=n;i++)
	{
		cout<<"x="; cin>>x;
		s=0;
		while(x)
		{
			s=s+x%10;
			x=x/10;
		}
		if(s==i) k++;
	}
	cout<<k;
	return 0;
}