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>
#define LL unsigned long long int
#define REP(i, n) for(int i = 0; i < (n); ++i)
#define FOR(i, f, n) for(int i = (f); i <= (n); ++i)
using namespace std;

LL f(LL n)
{
    LL w = 0;
    while(n)
    {
        w += (n%10)*(n%10);
        n /= 10;
    }
    return w;
}

int main()
{
    LL k, a, b;
    scanf("%llu%llu%llu", &k, &a, &b);
    int w = 0;
    for(int i = 1; i <= 9*9*17 && i <= b/k; ++i)
    {
        LL n = k*i;
        if(a <= n && n <= b && f(n) == i)
            ++w;
    }
    printf("%d\n", w);
    return 0;
}