#include <stdio.h>
int main()
{
	int i = 0, j = 0;
	int n = 1;
	int count = 0;
	for (i = 100; i < 999; i++)
	{
		n = 1;
		for (j = 2; j < i; j++)
		{
			if (i%j == 0)
			{
				n = 0;
			}
		}
			if (n == 1)
			{
				count++;
			}
	}
	printf("%d ", count);
	return 0;
}