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#include <iostream>
#include <stdint.h>
using namespace std;


int main() {

int64_t k, a, b, n, p=0,m;
int o=0;
cin >> k >> a >> b;

n = ((a + k - 1) / k) * k;
while(n<=b){
      m=n;
      p=0;
      while(m!=0){
          p=p+(m%10)*(m%10);
          m=m/10;
      }
      
      if(p*k==n){o=o+1;}
      n=n+k;
      }
cout << o;

  return 0;
  }