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
33
#include <iostream>

using namespace std;

int main()
{
    unsigned long long k,a,b,fn, s, t, m, c=0;
	cin>>k>>a>>b;
	
    for(fn=k; fn<=k*1400; fn+=k)
        if(fn>=a && fn<=b)
        {
            s = 0;
            t = fn;
            m = 10;
            do{
                s+=(t%m)*(t%m);
                t/=m;

            }while(t);

            if(s == fn/k)
            {
                //cout<<fn<<" ";
                c++;
            }

		}
	
	cout<<c<<endl;
		
	return 0;
}