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#include<iostream>
#define ft first
#define sd second
#define pb push_back
using namespace std;

long long f( long long x) {
    long long wyn = 0;
    for(int i= 0;i<20;i++){
        wyn += (x%10)*(x%10);
        x/=10;
    }
    return wyn;
}

int main(){
	long long k, a, b, wyn = 0;
	cin >> k >> a >> b;
	for (int i = 1;i < 2000 ;i++) {
        if(k * i>1000000000000000000LL) break;
        long long y = f (k * i);
        if (y==i && k*i>=a && k*i <= b) wyn++;
	}
	cout << wyn;
}