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#include <iostream>
#include <string>
#include <cmath>

int main()
{
	long long k, a, b;
	std::cin >> k >> a >> b;

	long long results = 0;
	long long function = 0;
	long long result = 0;
	long long tempA = 0;
	while(a%k != 0)
        a++;
	for(; a<=b; a+=k)
	{
		function = 0;
		result = a/k;
		long long tempA = a;
		while(tempA>0)
		{
			function += (tempA%10) * (tempA%10);
			tempA /= 10;
		}

		if(function == result)
			results++;
	}

	std::cout << results;
	return 0;
}