1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ll;

const ll MAX = 1500;

ll f(ll x)
{
	ll sum = 0;
	while(x)
	{
		sum += (x % 10)*(x % 10);
		x /= 10;
	}
	return sum;
}
int main()
{
	ll a, b, k;
	scanf("%llu%llu%llu", &k, &a, &b);
	if(a % k != 0)
		a += k - (a % k);
	int S = 0;
	for( ; a <= b &&  a/k <= MAX; a += k)
		if(f(a) == a/k)
			++S;
	
	printf("%d\n", S);
	
	return 0;
}