#include <iostream>
using namespace std;
short m,n;
bool check(short n)
{
	for (int a = 2;a < n;a++)
	{
		if (n % a == 0)
			return false;
	}
	return true;
}
int main()
{
	cin >> m >> n;
	short ans = 0;
	for (int i = m;i <= n;i += 2)
	{
		for (int j = 2;j < i / 2 + 1;j++)
		{
			for (int k = 2100;k >= j;k--)
			{
				if (j + k == i)
				{
					if (check(j))
					{
						if (check(k))
						{
							cout << j << '+' << k << '=' << i << endl;
							ans++;
						}
					}
				}
			}
		}
	}
	cout << ans;
	return 0;
}