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#include <iostream>

using namespace std;

long long int sqrts(long long int n){
        long long int ans = 0;
        long long int tmp;

        while(n){
                tmp = n%10;
                ans += tmp*tmp;
                n = n/10;
        }
        return ans;
}

int main(){
        long long int k, a, b, ans=0;

        cin >> k >> a >> b;


        for(long long int i=a; i<=b; i++){
                if(sqrts(i)*k == i){
                        ans++;
                }
        }
        cout << ans << endl;

        return 0;
}