próbna pa15

#include <iostream>
#include <cstdint>
#include <utility>

using namespace std;

uint64_t sum_sqr_dig(uint64_t  n){
    uint64_t res=0;
    while(n>0) {
        res+=(n%10)*(n%10);
        n=n/10;
    }
    return res;
}

int main(){
    uint64_t k, a, b;
    int counter=0;
    cin>>k>>a>>b;
    for (uint64_t i = 1 ; i<=min((uint64_t)9*9*18,b/k); i++){
        uint64_t n = i*k;
        uint64_t x= sum_sqr_dig(n);
        if ((x==i) && (a<=n) && (n<=b) )
            counter++;
    }
    cout<<counter<<endl;
}