#include <stdio.h>
int main()
{
	int n,counter,a[100];
	while(scanf("%d",&n)==1)
	{
		counter=0;
		for(int i=0;i<n;i++)
		{
			scanf("%d",&a[i]);
			if(a[i]==90)
				counter++;
		}
		printf("%d\n",counter);
		break;
	}
	return 0;
}
/**************************************************************
	Problem: 2095
	User: admin
	Language: C
	Result: Accepted
	Time:15 ms
	Memory:1144 kb
****************************************************************/