C :

#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;
}

C++ :

#include<iostream>
using namespace std;
int main()
{
    int n,a,count=0;
    cin>>n;
    while(n--)
    {
        cin>>a;
        if(a==90)
            count++;
    }
    cout<<count<<endl;
    return 0;
}