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
32
#include <iostream>

using namespace std;

#define MAXSUM 9*9*19
#define MAXK 1000000000000000000ll

int sum(long long x){
    int res = 0;
    while(x > 0){
        short num = x%10;
        res+=num*num;
        x/=10;
    }
    return res;
}

int main(){
    long long k,a,b;
    cin>>k;
    cin>>a;
    cin>>b;
    long long lim = MAXK/k;
    int ans = 0;
    for(int i=0; i <= MAXSUM &&  i<=lim;++i){
        long long n = k*i;
        if(i == sum(n) && n <=b && n>=a)
            ++ans;
    }
    cout<<ans;
    return 0;
}